pointers1.docx

8/10/2019 pointers1.docx

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(a)Invalid statement

(b) ptr is a function that accepts an argument which is a pointer to a integer returns an integer

quantity

(c)ptr is a function pointer

(d)None of these

[Q006] Several declarations involving pointers are shown below. Pick the correct

solution.

int *ptr(int *a);


(b)ptr is a function pointer that accepts an argument which is a pointer to a integer returns

an integer quantity

(c) ptr is a function that accepts an argument which is a pointer to a integer returns a pointer to an

integer quantity

(d)None of these

[Q007] Several declarations involving pointers are shown below. Pick the correct solution.

int (*ptr)(char *a);


(b) ptr is a pointer to a function that accepts an argument which is a pointer to a character retur ns

an integer quantity

(c)ptr is a function that accepts an argument which is a pointer to a character returns a

pointer to an integer quantity

(d)None of these


int (*ptr(int *b))[5];

(a)Invalid statement(b)ptr is a pointer to a function that accepts pointer to an integer returns a 5 -element

integer array

(c) ptr is a function that accepts an argument which is a pointer to a integer returns a pointer to a 5 -

element integer array

(d)None of these


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char ptr(int (*a)[]);


(b)ptr is a function that acce pts an argumen t which is a pointer to a integer array returns an

character quantity

(c)ptr is a function that accepts an argument which is an array of pointers to integers

returns an character quantity

(d)None of these

[Q010] Several declarations involving pointers are shown below. Pick the correct solution.char ptr(int *a[]);


(b)ptr is a function that accepts an argument which is a pointer to a integer array returns

an character quantity

(c) ptr is a function that accepts an argument which is an array of pointers to integers returns an

character quantity

(d)None of these


int *ptr(char a[]);

(a)ptr is a function pointer

(b)ptr is a function that accepts an argument which is a character array returns an integer

(c) ptr is a function that accepts an argument which is a character array returns a pointer to an

integer quantity

(d)None of these


int *ptr(char *a[]);

(a)ptr is a function pointer

(b)ptr is a function that accepts an argument which is a pointer to a character array


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returns a pointer to an integer quantity

(c) ptr is a function that accepts an argument which is a array of pointers to characters returns a

pointer to an integer quantity

(d)None of these


int (*ptr)(char (*a)[]);

(a)ptr is a function that accepts an argument which is a pointer to a character array


(b)p tr is a pointer to a function that accepts an argument which is a pointer to a character

array returns an integer quantity

(c)ptr is a pointer to a function that accepts an argument which is a array of pointers to

characters returns an integer quantity (d)None of these


int *(*ptr)(char (*a)[]);



(b )ptr is a pointer to a function that accepts an argument which is a pointer to a character array


(c)ptr is a pointer to a function that accepts an argument which is a array of pointers to

characters returns a pointer to an integer quantity

(d)None of these


int *(*ptr)(char (*a)[]);



(b)ptr is a pointer to a function that accepts an argument which is a pointer to a character

array returns a pointer to an integer quantity

(c)ptr is a pointer to a function t hat accepts an argument which is an array of pointers to

characters returns a pointer to an integer quantity


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(d)None of these


int (*ptr[10])(void);


(b)ptr is a function that returns an integer quantity

(c) ptr is a 10-element array of pointers to functions. Each function returns an integer quantity.

(d)ptr is pointer to a function that returns a pointer to a 10-element integers


int (*ptr[10])(float a);



(c) ptr is a 10-element array of pointers to functions. Each function accepts an argument which is a

float and returns an integer quantity.

(d)ptr is pointer to a function that accepts an argument which is a float and returns a

pointer to a 10-element integers


int *(*ptr[10])(float a);



(c)ptr is a 10-element array of pointers to functions. Each function accepts an argument

which is a float and returns an integer quantity.

(d) ptr is a 10-element array of pointers to functions. Each function accepts an argument which is a

float and returns a pointer to an integer quantity.


int *(*ptr[10])(float *a);


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(a) 1234 1234 (b)1235 1235 (c)1234 1235 (d)1235 1234

[Q003] What will be the output of the following program :

int main()

{

int val=1234;

int *ptr=&val;

printf("%d %d",val,++*ptr);

return(0);

}

(a)1234 1234 (b) 1235 1235 (c)1234 1235 (d)1235 1234


int main()

{

int val=1234;

int *ptr=&val;

printf("%d %d",val,(*ptr)++);

return(0);

}

(a)1234 1234 (b)1235 1235 (c)1234 1235 (d) 1235 1234


int main()

{

int val=1234;

int *ptr=&val;

printf("%d %d",++val,(*(int *)ptr)--);

return(0);


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}

(a)1234 1233 (b)1235 1234 (c) 1234 1234 (d)None of these


int main()

{

int a=555,*ptr=&a,b=*ptr;

printf("%d %d %d",++a,--b,*ptr++);

return(0);}

(a)Compile-Time Error (b)555 554 555 (c) 556 554 555 (d)557 554 555


int main()

{int a=555,b=*ptr,*ptr=&a;

printf("%d %d %d",++a,--b,*ptr++);

return(0);

}

(a) Compile-Time Error (b)555 554 555 (c)556 554 555 (d)557 554 555


int main()

{

int a=555,*ptr=&a,b=*ptr;

printf("%d %d %d",a,--*&b,*ptr++);

return(0);


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}

(a)Compile-Time Error (b) 555 554 555 (c)556 554 555 (d)557 554 555


int main()

{

int a=555,*ptr=&a,b=*ptr=777;

printf("%d %d",--*&b,*(int *)&b);

return(0);

}

(a)Compile-Time Error (b) 776 777 (c)554 555 (d)None of these


int main()

{

int a=5u,*b,**c,***d,****e;

b=&a;

c=&b;

d=&c;

e=&d;

printf("%u %u %u %u",*b-5,**c-11,***d-6,65535+****e);

return(0);

}

(a)Compile-Time Error (b) 0 65530 65535 4

(c)0 65530 65535 65539 (d)0 -6 -1 -2


int main()


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{

float val=5.75;

int *ptr=&val;

printf("%.2f %.2f",*(float *)ptr,val);

return(0);

}

(a)Compile-Time Error (b)5.75 5.75 (c)5.00 5.75 (d)None of these


int main()

{

int val=50;const int *ptr1=&val;

int const *ptr2=ptr1;

printf("%d %d %d",++val,*ptr1,*ptr2);

*(int *)ptr1=98;

printf("\n%d %d %d",++val,*ptr1,*ptr2);

return(0);

}

(a)Compile-Time Error

(b)51 50 5099 98 98

(c)Run-Time Error

(d)None of these


int main()

{

int val=77;const int *ptr1=&val;

int const *ptr2=ptr1;

printf("%d %d %d",--val,(*ptr1)++,*ptr2);

return(0);

}


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(a)Compile-Time Error (b)77 78 77 (c)76 77 77 (d)77 77 77


int main()

{

int a=50,b=60;

int* const ptr1=&a;

printf("%d %d",--a,(*ptr1)++);

ptr1=&b;

printf("\n%d %d",++b,(*ptr1)++);

return(0);

}(a)Compile-Time Error

(b)49 50

61 60

(c)50 50

62 60

(d)None of these


int main()

{

int a=50;

const int* const ptr=&a;

printf("%d %d",*ptr++,(*ptr)++);

return(0);

}

(a)Compile-Time Error (b)51 51 (c)51 50 (d)None of these


int main()

{


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int val=77;

const int const *ptr=&val;

printf("%d",*ptr);

return(0);

}

(a)Compile-Time Error (b)Run-Time Error (c)77 (d)None of these


int main()

{

int a[]={1,2,3,4,5,6};

int *ptr=a+2;printf("%d %d",--*ptr+1,1+*--ptr);

return(0);

}

(a)Compile-Time Error (b)1 2 (c)2 3 (d)1 3


int main()

{

int a[]={1,2,3,4,5,6};

int *ptr=a+2;

printf("%d %d",*++a,--*ptr);

return(0);

}

(a)Compile-Time Error (b)2 2 (c)3 2 (d)4 2


int main()


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{

int matrix[2][3]={{1,2,3},{4,5,6}};

printf("%d %d %d\n",*(*(matrix)),*(*(matrix+1)+2),*(*matrix+1));

printf("%d %d %d",*(matrix[0]+2),*(matrix[1]+1),*(*(matrix+1)));

return(0);

}


(b)1 5 2

6 3 4

(c)1 6 2

3 5 4

(d)1 6 2

3 4 5


int main()

{

int (*a)[5];

printf("%d %d",sizeof(*a),sizeof(a));

return(0);

}


(b)2 5

(c)10 4

(d)None of these

1. What is the output of this C code?

1. #include

2. int main ()

3. {

4. char *p = NULL ;

5. char *q = 0;


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6. if (p )

7. printf (" p " );

8. else

9. printf ("nullp" );

10. if (q ) 11. printf ("q \n ");

12. else

13. printf (" nullq \n ");

14. }

a) nullp nullq b) Depends on the compilerc) x nullq where x can be p or nullp depending on the value of NULLd) p q


1. #include

2. int main ()

3. {

4. int i = 10;

5. void *p = &i ;

6. printf ("%d \n ", (int)*p );

7. return 0;

8. }

a) Compile time errorb) Segmentation fault/runtime crashc) 10d) Undefined behaviour


1. #include

2. int main ()

3. {

4. int i = 10;

5. void *p = &i ;

6. printf ("%f \n ", *(float *)p );


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7. return 0;

8. }

a) Compile time errorb) Undefined behaviourc) 10d) 0.000000


1. #include

2. int *f ();

3. int main ()

4. {

5. int *p = f ();

6. printf ("%d \n ", *p );

7. }

8. int *f ()

9. {

10. int *j = (int*)malloc (sizeof (int));

11. *j = 10 ;

12. return j ;

13. }

a) 10 b) Compile time error

c) Segmentation fault/runtime crash since pointer to local variable is returnedd) Undefined behaviour


1. #include

2. int *f ();

3. int main ()

4. { 5. int *p = f ();

6. printf ("%d \n ", *p );

7. }

8. int *f ()

9. {

10. int j = 10 ;


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11. return &j ;

12. }

a) 10b) Compile time errorc) Segmentation fault/runtime crashd) Undefined behaviour

6. Comment on the following pointer declaration?int *ptr, p;

a) ptr is a pointer to integer, p is notb) ptr and p, both are pointers to integerc) ptr is a pointer to integer, p may or may not bed) ptr and p both are not pointers to integer

7. What is the output of this C code?1. #include

2. int main ()

3. {

4. int *ptr , a = 10;

5. ptr = &a ;

6. *ptr += 1;

7. printf ("%d,%d/n" , *ptr , a );

8. }

a) 10,10b) 10,11c) 11,10d) 11,11

8. Comment on the following?const int *ptr;

a) You cannot change the value pointed by ptrb) You cannot change the pointer ptr itselfc) Both (a) and (b)

d) You can change the pointer as well as the value pointed by it


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Pointers and Addresses

1. Which is an indirection operator among the following?a) & b ) * c) -> d) .

2. Which of the following does not initialize ptr to null (assuming variable declaration of a asint a=0;?

a) i nt *ptr = &a; b) int *ptr = &a &a; c) int *ptr = a a; d) All of the mentioned


1. #include

2. int x = 0;

3. void main ()

4. {

5. int *ptr = &x ;

6. printf ("%p \n ", ptr );

7. x ++;


9. }

a) Same addr e ss b) Different address c) Compile time error d) Varies


1. #include

2. int x = 0;

3. void main () 4. {

5. int *const ptr = &x ;


7. ptr ++;


9. }

a) 0 1 b) Comp ile time error c) 0xbfd605e8 0xbfd605ec d) 0xbfd605e8 0xbfd605e8


1. #include

2. void main ()

3. {

4. int x = 0;

5. int *ptr = &x ;



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7. ptr ++;


9. }

a) 0xbfd605e8 0xbfd6 05e c b) 0xbfd605e8 0cbfd60520 c) 0xbfd605e8 0xbfd605e9

d) Run time error


1. #include

2. void main ()

3. {

4. int x = 0;

5. int *ptr = &5;


7. }

a) 5 b) Address of 5 c) Nothing d) C om pile time error


1. #include

2. void main ()

3. {

4. int x = 0;

5. int *ptr = &x ;

6. printf ("%d \n ", *ptr );

7. }

a) Address of x b) Junk value c) 0 d) Run time error

Pointers and Function Arguments:

1. Which of the following can never be sent by call-by-value?

a) Variable b) Ar ra y c) Structures d) Both (b) and (c)2. Which type of variables can have same name in different function:a) global variables b) static variables c) Function argumentsd) Both (b) a nd (c) 3. Arguments that take input by user before running a program are called?a) main function arguments b) main argumentsc) Command-Line argumen ts d) Parameterized arguments


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4. The maximum number of arguments that can be passed in a single function are_____________a) 127 b) 2 53 c) 361 d) No limits in number of arguments5. What is the output of this C code?

1. #include

2. void m (int *p , int *q )

3. {

4. int temp = *p ; *p = *q ; *q = temp ;

5. }

6. void main ()

7. {

8. int a = 6, b = 5;

9. m(&a , &b );

10. printf ("%d %d \n ", a , b );

11. }

a) 5 6 b) 6 5 c) 5 5 d) 6 66. What is the output of this C code?

1. #include

2. void m (int *p )

3. {

4. int i = 0;

5. for (i = 0;i < 5; i ++)

6. printf ("%d \t ", p [i ]);

7. }


10. int a [5] = {6, 5, 3};

11. m(&a );

12. }

a) 0 0 0 0 0 b) 6 5 3 0 0 c) Run time error d) 6 5 3 junk junk7. What is the output of this C code?

1. #include

2. void m (int p , int q )

3. {

4. int temp = p ;

5. p = q ;

6. q = temp ;

7. }

8. void main ()

9. {


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6. foo ((&i )++);

7. }

8. void foo (int *p )

9. {

10. printf ("%d\n

", *p ); 11. }

a) 10b) Some garbage valuec) Compile time errord) Segmentation fault/code crash

Answer:c


1. #include

2. void foo (int*);

3. int main ()

4. {

5. int i = 10, *p = &i ;

6. foo (p ++);

7. }


9. {

10. printf ("%d \n ", *p );

11. }

a) 10b) Some garbage valuec) Compile time errord) Segmentation fault

Answer:a


1. #include

2. void foo (float *);

3. int main ()

4. {

5. int i = 10, *p = &i ;

6. foo (&i );


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7. }

8. void foo (float *p )

9. {

10. printf ("%f \n ", *p );

11. } a) 10.000000b) 0.000000c) Compile time errord) Undefined behaviour

Answer:b


1. #include

2. int main ()

3. {

4. int i = 97, *p = &i ;

5. foo (&i );

6. printf ("%d " , *p );

7. }


9. {

10. int j = 2;

11. p = &j ;

12. printf ("%d " , *p );

13. }

a) 2 97b) 2 2c) Compile time errord) Segmentation fault/code crash

Answer:a


1. #include

2. int main ()

3. {

4. int i = 97, *p = &i ;

5. foo (&p );


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6. printf ("%d " , *p );

7. return 0;

8. }

9. void foo (int **p )

10. { 11. int j = 2;

12. *p = &j ;

13. printf ("%d " , **p );

14. }

a) 2 2b) 2 97c) Undefined behaviourd) Segmentation fault/code crash

Answer:a


1. #include

2. int main ()

3. {

4. int i = 11 ;

5. int *p = &i ;

6. foo (&p );

7. printf ("%d " , *p );

8. }

9. void foo (int *const *p )

10. {

11. int j = 10 ;

12. *p = &j ;

13. printf ("%d " , **p );

14. }

a) Compile time errorb) 10 10c) Undefined behaviourd) 10 11

Answer:a



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1. #include

2. int main ()

3. {

4. int i = 10;

5. int *p = &i ; 6. foo (&p );

7. printf ("%d " , *p );

8. printf ("%d " , *p );

9. }

10. void foo (int **const p )

11. {

12. int j = 11 ;

13. *p = &j ;

14. printf ("%d " , **p );

15. }

a) 11 11 11b) 11 11 Undefined-valuec) Compile time errord) Segmentation fault/code-crash

Answer:b

8. What is the output of the code below?

1. #include

2. int main ()

3. {

4. int i = 10;

5. int *const p = &i ;

6. foo (&p );

7. printf ("%d \n ", *p );

8. }

9. void foo (int **p )

10. { 11. int j = 11 ;

12. *p = &j ;

13. printf ("%d \n ", **p );

14. }

a) 11 11b) Undefined behaviour


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c) Compile time errord) Segmentation fault/code-crash

Answer:a

9. Which of the following are correct syntaxes to send an array as a parameter to function:a) func(&array);b) func(array);c) func(*array);d) func(array[size]);View Answer

Answer:a & b

Pointers to array


1. #include

2. void main ()

3. {

4. int a [3] = {1, 2, 3};

5. int *p = a ;

6. printf ("%p \t %p" , p , a );

7. }

a) Same address is printed.b) Different address is printed.c) Compile time errord) Nothing

Answer:a


1. #include


4. char *s = "hello" ;

5. char *p = s ;

6. printf ("%p \t %p" , p , s );

7. }


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a) Different address is printedb) Same address is printedc) Run time errord) NothingView Answer

Answer:b


1. #include

2. void main ()

3. {


5. char *p = s ;

6. printf ("%c \t %c" , p [0], s [1]);

7. }

a) Run time errorb) h hc) h ed) h lView Answer

Answer:c


1. #include

2. void main ()

3. {


5. char *p = s ;

6. printf ("%c \t %c" , *(p + 3), s [1]);

7. }

a) h eb) l lc) l od) l eView Answer

Answer:d


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2. int main ()

3. {

4. double *ptr = (double *)100 ;

5. ptr = ptr + 2;

6. printf ("%u" , ptr ); 7. }

a) 102b) 104c) 108d) 116View Answer

Answer:d

2. Comment on the output of this C code?

1. #include

2. int main ()

3. {

4. int *p = (int *)2;

5. int *q = (int *)3;

6. printf ("%d" , p + q );

7. }

a) 2

b) 3c) 5d) Compile time errorView Answer

Answer:d3. Which of the following operand can be applied to pointers p and q?

(Assuming initialization as int *a = (int *)2; int *b = (int *)3;)a) a + bb) a bc) a * bd) a / bView Answer

Answer:b4. What is the size of *ptr in a 32-bit machine, (assuming initialization as int *ptr = 10;)?a) 1b) 2c) 4


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d) 8View Answer

Answer:c5. Which of following logical operation can be applied to pointers?

(Assuming initialization int *a = 2; int *b = 3;)a) a | bb) a ^ bc) a & bd) None of the mentionedView Answer

Answer:d


1. #include

2. void main ()

3. {


5. char *p = s ;

6. printf ("%c \t %c" , *(p + 1), s [1]);

7. }

a) h eb) e l

c) h hd) e eView Answer

Answer:d


1. #include

2. void main ()

3. { 4. char *s = "hello" ;

5. char *p = s ;

6. printf ("%c \t %c" , *p , s [1]);

7. }

a) e hb) Compile time error


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1. #include

2. int main ()

3. { 4. const int ary [4] = {1, 2, 3, 4};

5. int *p ;

6. p = ary + 3;

7. *p = 5;

8. printf ("%d \n ", ary [3]);

9. }

a) 4b) 5c) Compile time errord) 3View Answer

Answer:b3. Different ways to initialize an array with all elements as zero area) int array[5] = {};b) int array[5] = {0};c) int a = 0, b = 0, c = 0;

int array[5] = {a, b, c};d) All of the mentioned

View Answer Answer:d4. The elements in the array of the following code are

int array[5] = {5};a) 5, 5, 5, 5, 5b) 5, 0, 0, 0, 0c) 5, (garbage), (garbage), (garbage), (garbage)d) (garbage), (garbage), (garbage), (garbage), 5View Answer

Answer:b

5. Which of the following declaration is illegal?a) int a = 0, b = 1, c = 2;

int array[3] = {a, b, c};b) int size = 3;

int array[size];c) int size = 3;

int array[size] = {1, 2, 3};


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c) 4d) 8View Answer

Answer:c5. Which of following logical operation can be applied to pointers?

(Assuming initialization int *a = 2; int *b = 3;)a) a | bb) a ^ bc) a & bd) None of the mentionedView Answer

Answer:d


1. #include

2. void main ()

3. {


5. char *p = s ;

6. printf ("%c \t %c" , *(p + 1), s [1]);

7. }

a) h e

b) e lc) h hd) e eView Answer

Answer:d


1. #include



5. char *p = s ;

6. printf ("%c \t %c" , *p , s [1]);

7. }


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a) e hb) Compile time errorc) h hd) h eView Answer

Answer:d


1. #include

2. void main ()

3. {


5. char *n = "cjn" ;

6. char *p = s + n ;

7. printf ("%c \t %c" , *p , s [1]);

8. }

a) h eb) Compile time errorc) c od) h nView Answer

Answer:b


1. #include

2. void main ()

3. {


5. char *p = s * 3;

6. printf ("%c \t %c" , *p , s [1]); 7. }

a) h eb) l ec) Compile time errord) l hView Answer


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5. int a [4] = {1, 2, 3, 4};

6. p = &a [3];

7. int *ptr = &a [2];

8. int n = (int*)p - ptr ;

9. printf ("%d\n

", n ); 10. }

a) 1b) Compile time errorc) Segmentation faultd) 4View Answer


1. #include

2. int main ()

3. {

4. int a [4] = {1, 2, 3, 4};

5. int b [4] = {1, 2, 3, 4};

6. int n = &b [3] - &a [2];

7. printf ("%d \n ", n );

8. }

a) -3

b) 5c) 4d) Compile time errorView Answer


1. #include

2. int main ()

3. { 4. int a [4] = {1, 2, 3, 4};

5. int *p = &a [1];

6. int *ptr = &a [2];

7. ptr = ptr * 1;

8. printf ("%d \n ", *ptr );

9. }


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d) Depends on the compilerView Answer

Character Pointers and Functions


1. #include

2. int main ()

3. {

4. char *str = "hello, world \n ";

5. char *strc = "good morning \n ";

6. strcpy (strc , str );

7. printf ("%s \n ", strc ); 8. return 0;

9. }

a) hello, worldb) Crash/segmentation fault c) Undefined behaviourd) Run time error


1. #include

2. int main ()

3. {

4. char *str = "hello world" ;

5. char strc [] = "good morning india \n ";

6. strcpy (strc , str );

7. printf ("%s \n ", strc );

8. return 0;

9. }

a) hello world

b) hello worldg indiac) Compile time errord) Undefined behaviour



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1. #include

2. int main ()

3. {

4. char *str = "hello, world!! \n ";

5. char strc [] = "good morning\n

"; 6. strcpy (strc , str );

7. printf ("%s \n ", strc );

8. return 0;

9. }

a) hello, world!!b) Compile time errorc) Undefined behaviourd) Segmenation fault


1. #include

2. int main ()

3. {

4. char *str = "hello, world \n ";

5. str [5] = '.';

6. printf ("%s \n ", str );

7. return 0;

8. }

a) hello. worldb) hello, worldc) Compile errord) Segmentation fault


1. #include

2. int main () 3. {

4. char str [] = "hello, world" ;

5. str [5] = '.';

6. printf ("%s \n ", str );

7. return 0;

8. }


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a) hello. worldb) hello, worldc) Compile errord) Segmentation fault


1. #include

2. int main ()

3. {


5. char strary [] = "hello world" ;

6. printf ("%d %d \n ", sizeof (str ), sizeof (strary ));

7. return 0;

8. }

a) 11 11b) 12 12c) 4 12 d) 4 11


1. #include

2. int main ()

3. {


5. char strary [] = "hello world" ;

6. printf ("%d %d \n ", strlen (str ), strlen (strary ));

7. return 0;

8. }

a) 11 11 b) 12 11c) 11 12d) x 11 where x can be any positive integer.


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1. #include

2. void f (char *k )

3. { 4. k ++;

5. k [2] = 'm';

6. printf ("%c \n ", *k );

7. }

8. void main ()

9. {

10. char s [] = "hello" ;

11. f (s );

12. }

a) lb) ec) hd) o


1. #include

2. void fun (char *k )

3. {

4. printf ("%s" , k );

5. }

6. void main ()

7. {


9. fun (s );

10. }

a) hellob) Run time errorc) Nothingd) h



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1. #include

2. int main ()

3. {

4. char *str = "This" //Line 1

5. char *ptr = "Program\n

"; //Line 2 6. str = ptr ; //Line 3

7. printf ("%s, %s \n ", str , ptr ); //Line 4

8. }

a) Memory holding this is cleared at line 3 b) Memory holding this loses its reference at line 3 c) You cannot assign pointer like in Line 3d) Output will be This, ProgramView Answer

Answer:b

2. What type initialization is needed for the segment ptr[3] = 3; to work? a) char *ptr = Hello!; b) char ptr[] = Hello!; c) Both (a) and (b)d) None of the mentionedView Answer

Answer:b

3. The syntax for constant pointer to address (i.e., fixed pointer address) is:

a ) const *

b ) * const

c ) const *

d ) Both (a ) and (c ) View Answer

Answer:b


1. #include

2. int add (int a , int b )

3. {

4. return a + b ;

5. }

6. int main ()

7. {


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8. int (*fn_ptr )(int, int);

9. fn_ptr = add ;

10. printf ("The sum of two numbers is: %d" , (int)fn_ptr (2, 3));

11. }

a) Compile time error, declaration of a function inside main.b) Compile time error, no definition of function fn_ptr.c) Compile time error, illegal application of statement fn_ptr = add.d) No Run time error, output is 5.View Answer

Answer:d5. The correct way to declare and assign a function pointer is done by:

(Assuming the function to be assigned is int multi(int, int);) a) int (*fn_ptr)(int, int) = multi;b) int *fn_ptr(int, int) = multi;

c) int *fn_ptr(int, int) = &multi;d) Both (b) & (c)View Answer

Answer:a6. Calling a function f with a an array variable a[3] where a is an array, is equivalent toa) f(a[3])b) f(*(a + 3))c) f(3[a])d) All of the mentionedView Answer

Answer:d


1. #include

2. void f (char *k )

3. {

4. k ++;

5. k [2] = 'm';

6. }

7. void main ()

8. {


10. f (s );

11. printf ("%c \n ", *s );


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12. }

a) hb) ec) md) o;View Answer

Answer:a

8.What is the output of this C code?

1. #include

2. void main ()

3. {


5. s ++;

6. printf ("%c \n ", *s );

7. }

a) Compile time errorb) hc) ed) oView Answer

Answer:a

Pointers to Pointers


1. #include

2. void main ()

3. {

4. int k = 5; 5. int *p = &k ;

6. int **m = &p ;

7. printf ("%d%d%d \n ", k , *p , **m);

8. }

a) 5 5 5b) 5 5 junk value


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c) 5 junk junkd) Run time errorView Answer

Answer:a


1. #include

2. void main ()

3. {

4. int k = 5;

5. int *p = &k ;

6. int **m = &p ;

7. printf ("%d%d%d \n ", k , *p , **p );

8. }

a) 5 5 5b) 5 5 junk valuec) 5 junk junkd) Compile time errorView Answer

Answer:d


1. #include

2. void main ()

3. {

4. int k = 5;

5. int *p = &k ;

6. int **m = &p ;

7. **m = 6;

8. printf ("%d \n ", k );

9. } a) 5b) Compile time errorc) 6d) JunkView Answer

Answer:c


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Answer:d


1. #include 2. int main ()

3. {

4. int a = 1, b = 2, c = 3;

5. int *ptr1 = &a , *ptr2 = &b , *ptr3 = &c ;

6. int **sptr = &ptr1 ; //-Ref

7. *sptr = ptr2 ;

8. }

a) ptr1 points to ab) ptr1 points to bc) sptr points to ptr2d) None of the mentionedView Answer

Answer:b


1. #include

2. void main ()

3. {

4. int a [3] = {1, 2, 3};

5. int *p = a ;

6. int **r = &p ;

7. printf ("%p %p" , *r , a );

8. }

a) Different address is printedb) 1 2c) Same address is printed.

d) 1 1View Answer

Answer:c

1. What substitution should be made to //-Ref such that ptr1 points to variable C?


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1. #include

2. int main ()

3. {

4. int a = 1, b = 2, c = 3;

5. int *ptr1 = &a ; 6. int **sptr = &ptr1 ;

7. //-Ref

8. }

a) *sptr = &c;b) **sptr = &c;c) *ptr1 = &c;d) None of the mentioned.View Answer

Answer:a

2. Which of the following declaration throw run-time error?a) int **c = &c;b) int **c = &*c;c) int **c = **c;d) None of the mentionedView Answer

Answer:d


1. #include

2. int main ()

3. {

4. int a = 10;

5. int **c -= && a ;

6. }

a) You cannot apply any arithmetic operand to a pointer.b) We dont have address of an address operator c) Both (a) and (b)d) None of the mentioned.View Answer

Answer:b



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1. #include

2. void main ()

3. {

4. int k = 5;

5. int *p = &k ; 6. int **m = &p ;

7. printf ("%d%d%d \n ", k , *p , **m);

8. }


Answer:a


1. #include

2. void main ()

3. {

4. int k = 5;

5. int *p = &k ;

6. int **m = &p ;

7. printf ("%d%d%d \n ", k , *p , **p );

8. }


Answer:d


1. #include

2. void main ()

3. {

4. int k = 5;

5. int *p = &k ;


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7. for (j = 0; j < 3; j ++)

8. printf ("%d" , a [i ][j ]);

9. }

a) 1 2 3 4 5 0

b) 1 2 3 4 5 junkc) 1 2 3 4 5 5d) Run time errorView Answer

Answer:a


1. #include

2. void main ()

3. {

4. int a [2][3] = {1, 2, 3, , 4, 5};

5. int i = 0, j = 0;

6. for (i = 0; i < 2; i ++)

7. for (j = 0; j < 3; j ++)

8. printf ("%d" , a [i ][j ]);

9. }

a) 1 2 3 junk 4 5b) Compile time error

c) 1 2 3 0 4 5d) 1 2 3 3 4 5View Answer

Answer:b


1. #include

2. void f (int a [][ 3])

3. { 4. a [0][1] = 3;

5. int i = 0, j = 0;

6. for (i = 0; i < 2; i ++)

7. for (j = 0; j < 3; j ++)

8. printf ("%d" , a [i ][j ]);

9. }


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10. void main ()

11. {

12. int a [2][3] = {0};

13. f (a );

14. } a) 0 3 0 0 0 0b) Junk 3 junk junk junk junkc) Compile time errord) All junk valuesView Answer

Answer:a


1. #include

2. void f (int a [][])

3. {

4. a [0][1] = 3;

5. int i = 0, j = 0;

6. for (i = 0;i < 2; i ++)

7. for (j = 0;j < 3; j ++)

8. printf ("%d" , a [i ][j ]);

9. }

10. void main ()

11. {

12. int a [2][3] = {0};

13. f (a );

14. }

a) 0 3 0 0 0 0b) Junk 3 junk junk junk junkc) Compile time errord) All junk values

View Answer Answer:c


1. #include

2. void f (int a [2][])


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3. {

4. a [0][1] = 3;

5. int i = 0, j = 0;

6. for (i = 0;i < 2; i ++)

7. for (j = 0;j < 3; j ++) 8. printf ("%d" , a [i ][j ]);

9. }

10. void main ()

11. {

12. int a [2][3] = {0};

13. f (a );

14. }

a) 0 3 0 0 0 0b) Junk 3 junk junk junk junkc) Compile time errord) All junk valuesView Answer

Answer:c6. Comment on the following statement:

int (*a)[7];a) An array a of pointers. b) A pointer a to an array. c) A ragged array.

d) None of the mentionedView Answer Answer:b7. Comment on the 2 arrays regarding P and Q:

int *a1[8];int *(a3[8]);P. Array of pointersQ. Pointer to an array

a) a1 is P, a2 is Qb) a1 is P, a2 is P

c) a1 is Q, a2 is Pd) a1 is Q, a2 is QView Answer

Answer:b8. Which of the following is not possible statically in C?a) Jagged Arrayb) Rectangular Array


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c) Cuboidal Arrayd) Multidimensional ArrayView Answer

Answer:a

Here is a listing of C multiple choice questions on Multidimensional Arrays along with answers,

explanations and/or solutions:

1. What is the correct syntax to send a 3-dimensional array as a parameter?(Assuming declaration int a[5][4][3];)

a) func(a);b) func(&a);c) func(*a);

d) func(**a);View Answer

Answer:a2. Applications of multidimensional array are?a) Matrix-Multiplicationb) Minimum Spanning Treec) Finding connectivity between nodesd) All of the mentionedView Answer

Answer:d


1. #include

2. int main ()

3. {

4. int ary [2][3];

5. foo (ary );

6. }

7. void foo (int *ary [])

8. {

9. int i = 10, j = 2, k ;

10. ary [0] = &i ;

11. ary [1] = &j ;

12. *ary [0] = 2;


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13. for (k = 0;k < 2; k ++)

14. printf ("%d \n ", *ary [k ]);

15. }

a) 2 2

b) Compile time errorc) Undefined behaviourd) 10 2View Answer

Answer:a


1. #include

2. int main ()

3. {

4. int ary [2][3];

5. foo (ary );

6. }

7. void foo (int (*ary )[3])

8. {

9. int i = 10, j = 2, k ;

10. ary [0] = &i ;

11. ary [1] = &j ;

12. for (k = 0;k < 2; k ++)

13. printf ("%d \n ", *ary [k ]);

14. }

a) Compile time errorb) 10 2c) Undefined behaviourd) segmentation fault/code crashView Answer

Answer:a


1. #include

2. int main ()

3. {

4. foo (ary );


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6. printf ("%d \n ", ary [1][0]);

7. }

a) Compile time errorb) 4c) 1d) 2View Answer

Answer:a

Here is a listing of C quiz on Initialization of Pointer Arrays along with answers, explanations and/or

solutions:

1. To declare a 3 dimension array using pointers, which of the following is the correct syntax:a) char *a[][];b) char **a[];c) char ***a;d) All of the mentionedView Answer

Answer:a


1. #include 2. int main ()

3. {

4. char *a = {"p" , "r" , "o" , "g" , "r" , "a" , "m" };

5. printf ("%s" , a );

6. }

a) Output will be programb) Output will be pc) No output

d) Compile-time errorView Answer Answer:b3. An array of strings can be initialized by:a) char *a[] = {Hello, World}; b) char *a[] = {Hello, Worlds}; c) char *b = Hello;


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char *c = World; char *a[] = {b, c};

d) All of the mentioned.View Answer

Answer:d


1. #include

2. void main ()

3. {

4. char *a [10] = {"hi" , "hello" , "how" };

5. int i = 0;

6. for (i = 0;i < 10; i ++)

7. printf ("%s" , *(a [i ])) ;

8. }

a) Segmentation faultb) hi hello how followed by 7 null valuesc) 10 null valuesd) depends on compilerView Answer

Answer:a


1. #include

2. void main ()

3. {

4. char *a [10] = {"hi" , "hello" , "how" };

5. int i = 0, j = 0;

6. a [0] = "hey" ;

7. for (i = 0;i < 10; i ++)

8. printf ("%s \n ", a [i ]); 9. }

a) hi hello how Segmentation faultb) hi hello how followed by 7 null valuesc) hey hello how Segmentation faultd) Depends on compilerView Answer


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6. for (i = 0;i < 10; i ++)

7. printf ("%s" , a [i ]);

8. }

a) hi hello how Segmentation fault

b) hi hello how nullc) hey hello how Segmentation faultd) hi hello how followed by 7 nullsView Answer

Answer:d


1. #include

2. int main ()

3. {

4. char *p [1] = {"hello" };

5. printf ("%s" , (p )[0]);

6. return 0;

7. }

a) Compile time errorb) Undefined behaviourc) hello

d) None of the mentionedView Answer


1. #include

2. int main ()

3. {

4. char **p = {"hello" , "hi" , "bye" };

5. printf ("%s" , (p )[0]); 6. return 0;

7. }

a) Compile time errorb) Undefined behaviourc) hello


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1. #include

2. int main ()

3. {

4. int i = 0, j = 1;

5. int *a [] = {&i , &j }; 6. printf ("%d" , (*a )[1]);

7. return 0;

8. }

a) Compile time errorb) Undefined behaviourc) 1d) Some garbage valueView Answer

Answer:d

6. Which of the following are generated from char pointer?a) char *string = Hello.; b) char *string;

scanf(%s, string); c) char string[] = Hello.; d) Both (a) and (c).View Answer

Answer:a7. Which of the following declaration are illegal?a) int a[][] = {{1, 2, 3}, {2, 3, 4, 5}};b) int *a[] = {{1, 2, 3}, {2, 3, 4, 5}};c) int a[4][4] = {{1, 2, 3}, {2, 3, 4, 5}};d) Both (a) and (b).View Answer

Answer:a

Here is a listing of C programming questions on Pointers Vs. Multi- dimensional Arrays along with answers,


1. int a[10][20]; which is true for aa) a is true two-dimensional arrayb) 200 int-sized locations have been set asidec) The conventional rectangular subscript calculation 20 * row + col is used to find the elementa[row, col]


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d) All of the mentionedView Answer

Answer:d2. int *b[10]; which is true for ba) The definition only allocates 10 pointers and does not initialize themb) Initialization must be done explicitlyc) Both a and bd) ErrorView Answer

Answer:c


1. #include

2. void main ()

3. {

4. char a [10][5] = {"hi" , "hello" , "fellows" };

5. printf ("%s" , a [2]);

6. }

a) fellowsb) fellowc) fellod) fell



1. #include

2. void main ()

3. {


5. printf ("%p \n ", a ); 6. printf ("%p" , a [0]);

7. }

a) Same address is printedb) Different address is printedc) hello


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d) hi hello felloView Answer

Answer:a


1. #include

2. void main ()

3. {


5. printf ("%d" , sizeof (a [1])) ;

6. }

a) 2b) 4c) 5d) 10View Answer

Answer:c

6. What is the output of the code given below?

1. #include

2. int main ()

3. {

4. char a [1][5] = {"hello" };

5. printf ("%s" , a [0]);

6. return 0;

7. }

a) Compile time errorb) helloc) Undefined behaviourd) hellon


7. What is the output of the code given below?

1. #include

2. int main ()


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3. {

4. char *a [1] = {"hello" };

5. printf ("%s" , a [0]);

6. return 0;

7. } a) Compile time errorb) helloc) Undefined behaviourd) hellonView Answer

Answer:b8. Which of the following statements are true?

P. Pointer to ArrayQ. Multi-dimensional array

a) P are static, Q are staticb) P are static, Q are dynamicc) P are dynamic, Q are staticd) P are dynamic, Q are dynamicView Answer

Answer:c

Here is a listing of C interview questions on Command Line Arguments along with answers, explanations

and/or solutions:

1. What does argv and argc indicate in command-line arguments?(Assuming: int main(int argc, char *argv[]) )

a) argument count, argument variableb) argument count, argument vectorc) argument control, argument variabled) argument control, argument vectorView Answer

Answer:b

2. Which of the following syntax is correct for command-line arguments?a) int main(int var, char *varg[])b) int main(char *argv[], int argc)c) int main()

{int argv, char *argc[];

}


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d) Both (a) and (b)View Answer

Answer:a3. In linux, argv[0] by command-line argument can be occupied bya) ./a.outb) ./testc) ./fun.out.outd) All of the mentionedView Answer

Answer:d4. What type of array is generally generated in Command-line argument?a) Single dimension arrayb) 2-Dimensional Square Arrayc) Jagged Array

d) 2-Dimensional Rectangular ArrayView Answer 5. What would be the output if we try to execute following segment of code (assuming the

following input cool brother in city)? printf(%s \n, argv[argc]);

a) (null)b) Cityc) InD. Segmentation FaultView Answer

Answer:a6. The first argument in command line arguments isa) The number of command-line arguments the program was invoked with;b) A pointer to an array of character strings that contain the argumentsc) Nothingd) Both a & bView Answer 7. The second (argument vector) in command line arguments isa) The number of command-line arguments the program was invoked with;b) A pointer to an array of character strings that contain the arguments,one per string.c) Nothingd) Both a & bView Answer

Answer:b8. argv[0] in command line arguments, isa) The name by which the program was invokedb) The name of the files which are passed to the program


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c) Count of the arguments in argv[] vectord) Both a & bView Answer

Answer:a

1. A program that has no command line arguments will have argca) Zerob) Negativec) Oned) TwoView Answer

Answer:c2. The index of the last argument in command line arguments isa) argc 2

b) argc + 1c) argcd) argc 1View Answer

Answer:d

3. What is the output of this C code (if run with no options or arguments)?

1. #include

2. int main (int argc , char *argv [])

3. {

4. printf ("%d \n ", argc );

5. return 0;

6. }

a) 0b) 1c) Depends on the platformd) Depends on the compilerView Answer

Answer:b

4. What is the output of this C code (run without any commandline arguments)?

1. #include



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3. {

4. while (argc --)

5. printf ("%s \n ", argv [argc ]);

6. return 0;

7. } a) Compile time errorb) Executablefilenamec) Segmentation faultd) UndefinedView Answer

Answer:b


1. #include


3. {

4. printf ("%s \n ", argv [argc ]);

5. return 0;

6. }

a) Segmentation fault/code crashb) Executable file namec) Depends on the platform


Answer:a


1. #include


3. {

4. while (*argv ++ != NULL ) 5. printf ("%s \n ", *argv );

6. return 0;

7. }



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Answer:a

7. What is the output of this C code (run without any command line arguments)?

1. #include


3. {

4. while (*argv != NULL )

5. printf ("%s \n ", *(argv ++));

6. return 0;

7. }

a) Segmentation fault/code crashb) Executable file namec) Depends on the platformd) Depends on the compilerView Answer

Answer:b

8. What is the output of this C code(run without any command line arguments)?

1. #include


3. {

4. while (argv != NULL )

5. printf ("%s \n ", *(argv ++));

6. return 0;

7. }



Answer:a

Here is a listing of C quiz on Pointer to Functions along with answers, explanations and/or solutions:


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1. Which function is not called in the following program?

1. #include

2. void first ()

3. { 4. printf ("first" );

5. }

6. void second ()

7. {

8. first ();

9. }

10. void third ()

11. {

12. second ();

13. }

14. void main ()

15. {

16. void (*ptr )() ;

17. ptr = third ;

18. ptr ();

19. }

a) Function firstb) Function second

c) Function thirdd) None of the mentionedView Answer

Answer:d2. How to call a function without using the function name to send parameters?a) typedefsb) Function pointerc) Both (a) and (b)d) None of the mentionedView Answer

Answer:b3. Correct syntax to pass a Function Pointer as an argumenta) void pass(int (*fptr)(int, float, char)){}b) void pass(*fptr(int, float, char)){}c) void pass(int (*fptr)){}d) void pass(*fptr){}View Answer


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Answer:a4. Which of the following is not possible in C?a) Array of function pointerb) Returning a function pointerc) Comparison of function pointerd) None of the mentionedView Answer

Answer:d


1. #include

2. void first ()

3. {

4. printf ("Hello World" );

5. }

6. void main ()

7. {

8. void *ptr () = first ;

9. ptr ++

10. ptr ();

11. }

a) Illegal application of ++ to void data type

b) pointer function initialized like a variablec) Both (a) and (b)d) None of the mentionedView Answer

Answer:c


1. #include

2. int mul (int a , int b , int c ) 3. {

4. return a * b * c ;

5. }

6. void main ()

7. {

8. int (*function_pointer )(int, int, int);


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9. function_pointer = mul ;

10. printf ("The product of three numbers is:%d" ,

11. function_pointer (2, 3, 4));

12. }

a) The product of three numbers is:24b) Run time errorc) Nothingd) VariesView Answer

Answer:a


1. #include

2. int mul (int a , int b , int c )

3. {


5. }

6. void main ()

7. {

8. int (function_pointer )(int, int, int);


10. printf ("The product of three numbers is:%d" ,

11. function_pointer (2, 3, 4));

12. }

a) The product of three numbers is:24b) Compile time errorc) Nothingd) VariesView Answer

Answer:b


1. #include

2. void f (int (*x )(int));

3. int myfoo (int);

4. int (*fooptr )(int);

5. int ((*foo (int)))( int);


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6. int main ()

7. {

8. fooptr = foo (0);

9. fooptr (10);

10. } 11. int ((*foo (int i )))( int)

12. {

13. return myfoo ;

14. }

15. int myfoo (int i )

16. {

17. printf ("%d \n ", i + 1);

18. }

a) 10b) 11c) Compile time errord) Undefined behaviourView Answer

Answer:b


1. #include

2. int mul (int a , int b , int c )

3. {


5. }

6. void main ()

7. {

8. int *function_pointer ;


10. printf ("The product of three numbers is:%d" , 11. function_pointer (2, 3, 4));

12. }

a) The product of three numbers is:24b) Compile time errorc) Nothing


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d) VariesView Answer

Answer:b


1. #include

2. int sub (int a , int b , int c )

3. {

4. return a - b - c ;

5. }

6. void main ()

7. {

8. int (*function_pointer )(int, int, int);

9. function_pointer = &sub ;

10. printf ("The difference of three numbers is:%d" ,

11. (*function_pointer )(2, 3, 4));

12. }

a) The difference of three numbers is:1b) Run time errorc) The difference of three numbers is:-5d) VariesView Answer

Answer:c3. One of the uses for function pointers in C isa) Nothingb) There are no function pointers in cc) To invoke a functiond) To call a function defined at run-time.View Answer


1. #include

2. void f (int);

3. void (*foo )() = f ;


5. {

6. foo (10);


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7. return 0;

8. }

9. void f (int i )

10. {

11. printf ("%d\n

", i ); 12. }

a) Compile time errorb) 10c) Undefined behaviourd) None of the mentionedView Answer

Answer:b


1. #include

2. void f (int);

3. void (*foo )(void ) = f ;


5. {

6. foo (10);

7. return 0;

8. }

9. void f (int i )

10. {

11. printf ("%d \n ", i );

12. }

a) Compile time errorb) 10c) Undefined behaviourd) None of the mentionedView Answer

Answer:a


1. #include

2. void f (int);

3. void (*foo )(float ) = f ;


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4. int main ()

5. {

6. foo (10);

7. }

8. void f (int i ) 9. {

10. printf ("%d \n ", i );

11. }

a) Compile time errorb) 10c) 10.000000d) Undefined behaviourView Answer

Answer:d


1. #include

2. void f (int (*x )(int));

3. int myfoo (int i );

4. int (*foo )(int) = myfoo ;

5. int main ()

6. {

7. f (foo (10));

8. }

9. void f (int (*i )(int))

10. {

11. i (11 );

12. }


14. {

15. printf ("%d \n ", i );

16. return i ; 17. }

a) Compile time errorb) Undefined behaviourc) 10 11d) 10 Segmentation faultView Answer


79/114

Answer:d


1. #include 2. void f (int (*x )(int));

3. int myfoo (int);

4. int (*foo )() = myfoo ;

5. int main ()

6. {

7. f (foo );

8. }

9. void f (int(*i )(int ))

10. { 11. i (11 );

12. }


14. {

15. printf ("%d \n ", i );

16. return i ;

17. }

a) 10 11b) 11c) 10d) Undefined behaviourView Answer

Answer:b

Here is a listing of C question bank on Complicated Declarations along with answers, explanations and/or

solutions:


1. #include

2. void main ()

3. {

4. struct student

5. {


80/114


81/114

3. {

4. int no = 5;

5. char name [20];

6. };


9. struct student s ;

10. s. no = 8;

11. printf ("hello" );

12. }

a) Nothingb) Compile time errorc) hellod) VariesView Answer

Answer:b


1. #include

2. struct student

3. {

4. int no ;

5. char name [20];

6. };

7. void main ()

8. {

9. student s ;

10. s. name = "hello" ;


12. }

a) Nothing

b) helloc) Compile time errord) VariesView Answer

Answer:c



82/114

1. #include

2. void main ()

3. {

4. struct student

5. { 6. int no ;

7. char name [20];

8. };


10. s. no = 8;

11. printf ("%s" , s. name );

12. }

a) Nothingb) Compile time errorc) Junkd) 8View Answer

Answer:c


1. #include

2. struct student

3. {

4. int no ;

5. char name [20];

6. };


8. void main ()

9. {

10. s. no = 8;


12. } a) Nothingb) Compile time errorc) Junkd) 8View Answer

Answer:a


83/114


1. #include

2. int main ()

3. { 4. int *((*x )())[ 2];

5. x ();

6. printf ("after x \n ");

7. }

8. int *((*x )())[ 2]

9. {

10. int **str ;

11. str = (int*)malloc (sizeof (int)* 2);

12. return str ;

13. }

a) Compile time errorb) Undefined behaviourc) After xd) None of the mentionedView Answer

Answer:a


1. #include

2. void (*(f )())( int, float );

3. void (*(*x )())( int, float ) = f ;

4. void ((*y )(int, float ));

5. void foo (int i , float f );

6. int main ()

7. {

8. y = x ();

9. y (1, 2); 10. }

11. void (*(f )())( int, float )

12. {

13. return foo ;

14. }

15. void foo (int i , float f )


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1. #include

2. struct student

3. {

4. int no ;

5. char name [20]; 6. }

7. void main ()

8. {


10. s. no = 8;


12. }

a) Compile time errorb) Nothingc) hellod) VariesView Answer

Answer:a


1. #include

2. struct student

3. {

4. int no = 5;

5. char name [20];

6. };

7. void main ()

8. {


10. s. no = 8;


12. } a) Nothingb) Compile time errorc) hellod) VariesView Answer

Answer:b


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1. #include

2. struct student

3. { 4. int no ;

5. char name [20];

6. };

7. void main ()

8. {

9. student s ;

10. s. no = 8;


12. }

a) Nothingb) helloc) Compile time errord) VariesView Answer

Answer:c


1. #include

2. void main ()

3. {

4. struct student

5. {

6. int no ;

7. char name [20];

8. };


10. s. no = 8; 11. printf ("%d" , s. no);

12. }

a) Nothingb) Compile time errorc) Junk


89/114

d) 8View Answer

Answer:d10. Is the below declaration legal?

int* ((*x)())[2];a) trueb) falsec) Undefined behaviourd) Depends on the standardView Answer

Answer:b

Here is a listing of C question bank on Complicated Declarations along with answers, explanations and/or

solutions:


1. #include

2. void main ()

3. {

4. struct student

5. {

6. int no ; 7. char name [20];

8. };


10. no = 8;

11. printf ("%d" , no );

12. }


Answer:b



90/114

1. #include

2. struct student

3. {

4. int no ;

5. char name [20]; 6. };

7. void main ()

8. {


10. s. no = 8;


12. }

a) Run time errorb) Nothingc) hellod) VariesView Answer

Answer:c


1. #include

2. struct student

3. {

4. int no = 5;

5. char name [20];

6. };

7. void main ()

8. {


10. s. no = 8;


12. } a) Nothingb) Compile time errorc) hellod) VariesView Answer

Answer:b


91/114


1. #include

2. struct student

3. { 4. int no ;

5. char name [20];

6. };

7. void main ()

8. {

9. student s ;

10. s. name = "hello" ;


12. }


Answer:c


1. #include

2. void main ()

3. {

4. struct student

5. {

6. int no ;

7. char name [20];

8. };


10. s. no = 8; 11. printf ("%s" , s. name );

12. }

a) Nothingb) Compile time errorc) Junk


92/114

d) 8View Answer

Answer:c


1. #include

2. struct student

3. {

4. int no ;

5. char name [20];

6. };


8. void main ()

9. {

10. s. no = 8;


12. }


Answer:a


1. #include

2. int main ()

3. {

4. int *((*x )())[ 2];

5. x ();

6. printf ("after x \n "); 7. }

8. int *((*x )())[ 2]

9. {

10. int **str ;

11. str = (int*)malloc (sizeof (int)* 2);

12. return str ;


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13. }

a) Compile time errorb) Undefined behaviourc) After xd) None of the mentionedView Answer

Answer:a


1. #include


3. void (*(*x )())( int, float ) = f ;

4. void ((*y )(int, float ));


6. int main ()

7. {

8. y = x ();

9. y (1, 2);

10. }


12. {

13. return foo ;

14. }


16. {

17. printf ("%d %f \n ", i , f );

18. }

a) 1 2.000000b) 1 2c) Compile time errord) Segmentation fault/code crash

View Answer Answer:a9. What does this declaration say?

int (*(*y)())[2];a) y is pointer to the function which returns pointer to integer arrayb) y is pointer to the function which returns array of pointersc) y is function which returns function pointer which in turn returns pointer to integer array


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d) y is function which returns array of integersView Answer

Answer:a


1. #include


3. typedef void (*(*x )())( int, float );


5. int main ()

6. {

7. x = f ;

8. x ();

9. }


11. {

12. return foo ;

13. }


15. {

16. printf ("%d %f \n ", i , f );

17. }

a) Compile time errorb) Undefined behaviourc) 1 2.000000d) NothingView Answer

Answer:a


1. #include 2. void (*(f )())( int, float );

3. typedef void (*(*x )())( int, float );


5. int main ()

6. {

7. x p = f ;


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8. p ();

9. }


11. {

12. return foo ; 13. }


15. {

16. printf ("%d %f \n ", i , f );

17. }

a) Compile time errorb) Undefined behaviourc) 1 2.000000d) NothingView Answer

Answer:d

Here is a listing of C multiple choice questions on Complicated Declarations along with answers,


1. Read the following expression?void (*ptr)(int);

a) ptr is pointer to int that converts its type to voidb) ptr is pointer to function passing int returning voidc) ptr is pointer to void that converts its type to intd) ptr is pointer to function passing void returning intView Answer

Answer:b2. Which of the following expression is true for the following?

ptr is array with 3 elements of pointer to function returning pointer of inta) int **ptr[3]();b) int *(*ptr[3])();c) int (*(*ptr[3])());d) None of the mentionedView Answer

Answer:b3. What do the following declaration denote?

int **ptr;a) ptr is a function pointer that returns pointer to int type


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b) ptr is a pointer to an int pointerc) ptr is a pointer to pointer to type intd) None of the mentionedView Answer

Answer:b4. What do the following declaration denote?

char *str[5];a) str is an array of 5 element pointer to type charb) str is a pointer to an array of 5 elementsc) str is a function pointer of 5 elements returning chard) None of the mentionedView Answer

Answer:a5. Comment on the following declaration?

int (*ptr)(); // i)char *ptr[]; // ii)

a) Both i) and ii) and cannot exist due to same nameb) i) is legal, ii) is illegalc) i) is illegal, ii) is legald) Both i) and ii) will work legal and flawlesslyView Answer

Answer:d


1. #include

2. struct student

3. {

4. int no ;

5. char name [20];

6. }

7. void main ()

8. {


10. s. no = 8;


12. }

a) Compile time errorb) Nothingc) hello


97/114


98/114


Answer:c


1. #include

2. void main ()

3. {

4. struct student

5. {

6. int no ;

7. char name [20];

8. };


10. s. no = 8;

11. printf ("%d" , s. no);

12. }

a) Nothingb) Compile time error

c) Junkd) 8View Answer

Answer:d10. Is the below declaration legal?

int* ((*x)())[2];a) trueb) falsec) Undefined behaviourd) Depends on the standardView Answer

Answer:b


struct {

int i;


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float f;

}var;

int main()

{

var.i=5;

var.f=9.76723;

printf("%d %.2f",var.i,var.f);

return(0);

}

(a)Compile-Time Error (b)5 9.76723 (c)5 9.76 (d)5 9.77

[Q002] What will be the output of the following program :int main()

{

int val=1234;

int* ptr=&val;

printf("%d %d",val,*ptr++);

return(0);

}

(a)Compile-Time Error (b) 1235 1235


struct values {

int i;

float f;

};

int main()

{

struct values var={555,67.05501};

printf("%2d %.2f",var.i,var.f);

return(0);

}


100/114


101/114


struct first {

int a;

float b;

}s1={32760,12345.12345};

typedef struct {

char a;

int b;

}second;

struct my_struct {

float a;

unsigned int b;

};

typedef struct my_struct third;

int main()

{

static second s2={'A',- -4};

third s3;

s3.a=~(s1.a-32760);

s3.b=-++s2.b;

printf("%d %.2f\n%c %d\n%.2f %u",(s1.a)--,s1.b+0.005,s2.a+32,s2.b,++(s3.a),--

s3.b);

return(0);

}(a)Compile-Time Error (b)32760 12345.12

A 4

1 -5

(c)32760 12345.13

a -5

0.00 65531

(d)32760 12345.13

a 5

0.00 65530


struct {

int i,val[25];

}var={1,2,3,4,5,6,7,8,9},*vptr=&var;


102/114

int main()

{

printf("%d %d %d\n",var.i,vptr->i,(*vptr).i);

printf("%d %d %d %d %d %d",var.val[4],*(var.val+4),vptr->val[4],*(vptr-

>val+4),(*vptr).val[4],*((*vptr).val+4));

return(0);

}

(a)Compile-Time Error (b)1 1 1

6 6 6 6 6 6

(c)1 1 1

5 5 5 5 5 5

(d)None of these


typedef struct {

int i;

float f;

}temp;

void alter(temp *ptr,int x,float y)

{

ptr->i=x;ptr->f=y;

}

int main()

{

temp a={111,777.007};

printf("%d %.2f\n",a.i,a.f);

alter(&a,222,666.006);

printf("%d %.2f",a.i,a.f);

return(0);

}

(a)Compile-Time error

(b)111 777.007

222 666.006

(c)111 777.01

222 666.01


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(d)None of these


typedef struct {

int i;

float f;

}temp;

temp alter(temp tmp,int x,float y)

{

tmp.i=x;

tmp.f=y;

return tmp;}

int main()

{

temp a={111,777.007};

printf("%d %.3f\n",a.i,a.f);

a=alter(a,222,666.006);


return(0);

}(a)Compile-Time error

(b)111 777.007

222 666.006

(c)111 777.01

222 666.01

(d)None of these

[Q010] What will be the output of the following program :typedef struct {

int i;

float f;

}temp;

temp alter(temp *ptr,int x,float y)

{


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temp tmp=*ptr;

printf("%d %.2f\n",tmp.i,tmp.f);

tmp.i=x;

tmp.f=y;

return tmp;

}

int main()

{

temp a={65535,777.777};

a=alter(&a,-1,666.666);


return(0);

}

(a)Compile-Time error

(b)65535 777.777

-1 666.666

(c)65535 777.78

-1 666.67

(d)-1 777.78

-1 666.67


struct my_struct1 {

int arr[2][2];

};

typedef struct my_struct1 record;

struct my_struct2 {

record temp;

}list[2]={1,2,3,4,5,6,7,8};

int main()

{

int i,j,k;for (i=1; i>=0; i--)

for (j=0; j=0; k--)

printf("%d",list[i].temp.arr[j][k]);

return(0);

}


105/114


(b)Run-Time Error

(c)65872143

(d)56781243


struct my_struct {

int i;

unsigned int j;

};

int main()

{

struct my_struct temp1={-32769,-1},temp2;

temp2=temp1;

printf("%d %u",temp2.i,temp2.j);

return(0);

}

(a)32767 -1

(b)-32769 -1

(c)-32769 65535

(d)32767 65535


struct names {

char str[25];

struct names *next;

};

typedef struct names slist;

int main()

{

slist *list,*temp;

list=(slist *)malloc(sizeof(slist)); // Dynamic Memory Allocation

strcpy(list->str,"Hai");

list->next=NULL;

temp=(slist *)malloc(sizeof(slist)); // Dynamic Memory Allocation

strcpy(temp->str,"Friends");


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temp->next=list;

list=temp;

while (temp != NULL)

{

printf("%s",temp->str);

temp=temp->next;

}

return(0);

}


(b)HaiFriends

(c)FriendsHai

(d)None of these


(i) struct A {

int a;

struct B {

int b;

struct B *next;

}tempB;

struct A *next;

}tempA;

(ii) struct B {

int b;

struct B *next;

};

struct A {

int a;

struct B tempB;

struct A *next;};

(iii) struct B {

int b;

}tempB;

struct {


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int a;

struct B *nextB;

};

(iv) struct B {

int b;

struct B {

int b;

struct B *nextB;

}tempB;

struct B *nextB;

}tempB;

(a) (iv) Only

(b) (iii) Only

(c)All of the these

(d)None of these


union A {

char ch;

int i;

float f;

}tempA;

int main()

{

tempA.ch='A';

tempA.i=777;

tempA.f=12345.12345;

printf("%d",tempA.i);

return(0);

}

(a)Compile-Time Error(b)12345

(c)Erroneous output

(d)777


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Size=4 bytes

(d)None of these

[Q018] What are the largest values that can be assigned to each of the bit fields defined in

[Q017] above.

(a)a=0 b=2 c=3 d=4

(b)a=1 b=2 c=7 d=15

(c)a=1 b=3 c=7 d=15

(d)None of these


int main()

{

struct sample {

unsigned a:1;

unsigned b:4;

}v={0,15};

unsigned *vptr=&v.b;

printf("%d %d",v.b,*vptr);

return(0);

}


(b)0 0

(c)15 15

(d)None of these


int main()

{

static struct my_struct {

unsigned a:1;

int i;

unsigned b:4;


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unsigned c:10;

}v={1,10000,15,555};

printf("%d %d %d %d",v.i,v.a,v.b,v.c);

printf("\nSize=%d bytes",sizeof v);

return(0);

}


(b)1 10000 15 555

Size=4 bytes

(c)10000 1 15 555

Size=4 bytes

(d)10000 1 15 555

Size=5 bytes

[Q001]

Ans. (d) Though both and are optional, one of

the two must appear. In the above program, i.e. var is used. (2

decimal places or) 2-digit precision of 9.76723 is 9.77

[Q002]

Ans. (d) Both and are optional. Thus the

structure defined in the above program has no use and program executes in the normal

way.

[Q003]

Ans. (c) The members of a structure variable can be assigned initial values in much the

same manner as the elements of an array. The initial values must appear in order in which

they will be assigned to their corresponding strucutre members, enclosed in braces and

separated by commas.


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[Q004]

Ans. (c) In the above program, values is the user-defined structure type or the new user-

defined data type. Structure variables can then be defined in terms of the n ew data type.

[Q005]

Ans. (a) C language does not permit the initialization of individual structure members

within the template. The initialization must be done only in the declaration of the actual

variables. The correct way to initialize the values is shown in [Q003] or [Q004].

[Q006]

Ans. (d) Illustrating 3 different ways of declaring the structres : first, second and third are

the user-defined structure type. s1, s2 and s3 are structure variables. Also an expression of

the form ++variable.member is equivalent to ++(variable.member), i.e. ++ operator will

apply to the structure member, not the entire structure variable.

[Q007]

Ans. (b) Since value of the member 'i' can be accessed using var.i, vptr->i and

(*vptr).i Similarly 5th value of the member 'val' can be accessed using var.val[4],

*(var.val+4), vptr->val[4], *(vptr->val+4), (*vptr).val[4] and *((*vptr).val+4)

[Q008]

Ans. (c) This program illustrates the transfer of a structure to a function by passing the

structure's address (a pointer) to the function.


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components. Rather, the data structure can expand or contract in size as required.]

[Q014]

Ans. (d) Since all the above structure declarations are valid in C.

[Q015]

Ans. (c) The above program produces erroneous output (which is machine dependent). In

effect, a union creates a storage location that can be used by any one of its members at a

time. When a different member is assigned a new value, the new value supercedes the

previous member's value. [NOTE : The compiler allocates a piece of storage that is large

enough to hold the largest variable type in the union i.e. all members share the same

address.]

[Q016]

Ans. (b) Since int (2 bytes) + float (4 bytes) = (6 bytes) + Largest among union is int (2

bytes) is equal to (8 bytes). Also the total number of bytes the array 'temp2' requires :

(8 bytes) * (5 bytes) = (40 bytes).

[Q017]

Ans. (b) The four fields within 'v' require a total of 10 bits and these bits can be

accomodated within the first word(16 bits). Unnamed fields can be used to control the

alignment of bit fields within a word of memory. Such f ields provide padding within the

word. [NOTE : Some compilers order bit-fields from righ-to-left (i.e. from lower-order bits

to high- order bits) within a word, whereas other compilers order the fields from left-to-


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