GTU Practical Solution

  Subject: Computer Programming and Utilization (2110003)

  [.B.E. 1st SEM : ALL BRANCHES]

1.1 Write a Program to display “WELCOME TO SILVER OAK INSTITUTE OF TECHNOLOGY” on the screen.

#include<stdio.h>#include<conio.h>void main(){printf("WELCOME TO SILVER OAK INSTITUTE OF TECHNOLOGY);getch();}

1.2 Write a Program to which accepts a character from keyboard & display its ASCII code.

#include<stdio.h>#include<conio.h>void main(){ char ascii; printf("Give character: "); scanf(“%c”,&ascii); printf("%c ascii value is: %d", ascii, ascii); getch();}

1.3 Write a program that reads two nos. from key board and gives their addition, subtraction, multiplication, division and modulo.

#include<conio.h>#include<stdio.h>void main(){

int a,b,add,sub,mul,div,mod;printf("Enter Two Numbers" );scanf(“%d%d”,&a,&b); printf("ARITHMETIC OPREATION\n" ); add=a+b;sub=a-b;mul=a*b;

div=a/b;mod=a%b; printf("\nAddition of two Number=%d",add);printf("\nSubstraction of two Number=%d",sub);printf("\nMultiplication of two Number=%d",mul);printf("\nDivision of two Number=%d",div);printf("\nModule of two Number=%d",mod);

getch();} 

1.4 Write a program to convert days into months and days.

#include<stdio.h>void  main(){ int d; printf("Enter days\n"); scanf("%d",&d); printf("%d years,%d months,%d days\n",d/365,(d%365)/30,(d%365)%30); getch();}

1.5. The distance between two cities (In KM) is input through key board. Write a program to convert and print this distance in meters, feet, inches & centimetres.

#include<stdio.h>#include<conio.h>void  main(){float km,m,feet,inch,cm;printf("Enter the distance between two cities(in km)-");scanf("%f",&km);

m = km*1000; //since 1km = 1000mfeet= km*3280.84; //since 1km=3280.84feetinch=km*39370.1; //since 1 km=39370.1inchescm=km*100000; //since 1km = 100000cm

printf("\nDistance in kilometres = %f ",km);printf("\nDistance in metres = %f ",m);printf("\nDistance in feet = %f ",feet);printf("\nDistance in inches = %f ",inch);printf("\nDistance in centimetres = %f ",cm);getch();}

1.6 Write a program to swap (interchange) values of two variables with and without using third variable.

#include<stdio.h>#include<conio.h>void  main(){ int x, y, temp; //Using third Variable printf("Enter the value of x and y\n"); scanf("%d%d", &x, &y); printf("Before Swapping\nx = %d\ny = %d\n",x,y); temp = x; x = y; y = temp; printf("After Swapping\nx = %d\ny = %d\n",x,y); getch();}

#include<stdio.h>#include<conio.h> void  main(){ int x, y, temp; // Without Using third Variable int a, b; printf("Enter two integers to swap\n"); scanf("%d%d", &a, &b); a = a + b; b = a - b; a = a - b; printf("After Swapping”); printf("a = %d\nb = %d\n",a,b); getch();}

PRACTICAL SET-2:

2.1 Write a Program to convert the Celsius to Fahrenheit. F=(C*1.8)+32

#include<stdio.h>#include<conio.h>void main(){ float fh,cl; printf("Enter temperature value in Celsius: "); scanf("%f", &cl); fh = (cl * 1.8)+ 32; printf("Converted Fahrenheit value: %f",fh); getch();}

2.2 Write a Program to find out simple interest. I=(P*R*N)/100

#include<stdio.h>#include<conio.h>void  main(){float p,n,r,i;printf("Enter the value of principle:");scanf("%f",&p);printf("Enter the value of rate:");scanf("%f",&r);printf("Enter the value of time:");scanf("%f",&n);i=(p*n*r)/100;printf("\nInterest: %f ",i);getch();}

2.3 Write a program to solve Quadratic Equation.

#include<stdio.h>#include<math.h>void main(){float a,b,c;float d,root1,root2; printf("Enter a, b and c of quadratic equation: ");scanf("%f%f%f",&a,&b,&c); d = b * b - 4 * a * c; if(d < 0){printf("Roots are complex number.\n"); printf("Roots of quadratic equation are: ");printf("%.3f%+.3fi",-b/(2*a),sqrt(-d)/(2*a));printf("%.3f%+.3fi",-b/(2*a),-sqrt(-d)/(2*a)); return 0;}else if(d==0){printf("Both roots are equal.\n"); root1 = -b /(2* a);printf("Root of quadratic equation is: %.3f ",root1); return 0;}else{printf("Roots are real numbers.\n");

root1 = ( -b + sqrt(d)) / (2* a);root2 = ( -b - sqrt(d)) / (2* a);printf("Roots of quadratic equation are: %.3f %.3f",root1,root2);}getch();}

PRACTICAL SET-3:

3.1. Write a program to reverse sequence of digit.

#include <stdio.h>int main(){  int n, reverse = 0;   printf("Enter a number to reverse\n");  scanf("%d",&n);   while (n != 0)  {     reverse = reverse * 10;     reverse = reverse + n%10;     n = n/10;  } printf("Reverse of entered number is = %d\n", reverse);return 0;}

3.2. Write a program to print first N prime numbers.( no factor other than 1 & itself)

#include<stdio.h>int main(){ int n, i = 3, count, c;  printf("Enter the number of prime numbers required\n"); scanf("%d",&n);  if ( n >= 1 ) { printf("First %d prime numbers are :\n",n); printf("2\n"); }  for ( count = 2 ; count <= n ; ) {

for ( c = 2 ; c <= i - 1 ; c++ ) { if ( i%c == 0 ) break; } if ( c == i ) { printf("%d\n",i); count++; } i++; } return 0;}

3.3. Write a program to print Armstrong number (or Narcissistic no) between 0 to 999. (Armstrong no= addition of cube of every digit of a no, e.g. 153 is Armstrong due to 1^3+5^3+3^3=153)

#include<stdio.h>int main(){ int n1, rem; printf("Enter a positive integer: "); scanf("%d", &n); for(i=1;i<=999;i++) { n1=i;num=0; while(n1!=0) { rem=n1%10; num+=rem*rem*rem; n1/=10; } if(num==i) printf("%d is an Armstrong number.",n); else printf("%d is not an Armstrong number.",n);} return 0;}

3.4. Write a program to find out whether a number is odd / even by using different if..else statements.

#include <stdio.h>int main(){ int num; printf("Enter an integer you want to check: ");

scanf("%d",&num); if((num%2)==0) /* Checking whether remainder is 0 or not. */ printf("%d is even.",num); else printf("%d is odd.",num); return 0;}

3.5. Write a program to find minimum no out of three numbers by using Control statement (nested..if ).

#include<stdio.h>#include<conio.h>void main(){int a,b,c;clrscr();

printf("Enter value of a::");scanf("%d",&a);printf("Enter value of b::");scanf("%d",&b);printf("Enter value of c::");scanf("%d",&c);

if(a<b){

if(a<c){

printf("\n a is smallest");}else{

printf("\n c is smallest");}

}else{ if(b<c)

{printf("\n b is smallest");

}else{

printf("\n c is smallest");}

}getch();}

3.6. Write a program to make simple calculator using switch..case statement.

# include <stdio.h>int main(){char o;float num1,num2;printf("Enter operator either + or - or * or / or %: ");scanf("%c",&o);printf("Enter two operands: ");scanf("%f %f",&num1,&num2);switch(o) {case '+':printf("%.1f + %.1f = %.1f",num1, num2, num1+num2);break;case '-':printf("%.1f - %.1f = %.1f",num1, num2, num1-num2);break;case '*':printf("%.1f * %.1f = %.1f",num1, num2, num1*num2);break;case '/':printf("%.1f / %.1f = %.1f",num1, num2, num1/num2);break;case '%':printf("%.1f % %.1f = %.1f",num1, num2, num1%num2);break;default:/* If operator is other than +, -, * , / or %, error message is shown */printf("Error! operator is not correct");break;}return 0;}

3.7. Write a program to find sum of all integers greater than 100 & less than 200 and are divisible by 5.

#include<stdio.h>#include<conio.h>void main(){

int i, sum=0;clrscr();

printf("All nos. between 100 - 200 which is divisible by\n");for(i=101;i<200;i++){   if(i%5==0)

  {      printf("%5d",i);      sum+=i;    }  }  printf("\n\nsum = %d",sum);  getch();}

3.8. Write a program to find whether a number is palindrome or not.

#include<stdio.h>int main(){ int n, reverse=0, rem,temp; printf("Enter an integer: "); scanf("%d", &n); temp=n; while(temp!=0) { rem=temp%10; reverse=reverse*10+rem; temp/=10; } /* Checking if number entered by user and it's reverse number is equal. */ if(reverse==n) printf("%d is a palindrome.",n); else printf("%d is not a palindrome.",n); return 0;}

PRACTICAL SET-4: * * * * * * * * * ** * * * *

#include <stdio.h>int main(){ int i, j;

for(i=1;i<=5;i++) { for(j=1;j<=i;j++) {

printf("*"); } printf("\n"); }return 0;

}

12 23 3 34 4 4 45 5 5 5 5

#include<stdio.h>int main(){ int i, j; for(i=1;i<=5;i++) { for(j=1;j<=i;j++) { printf("%d",i); } printf("\n"); } return 0;}

1 0 1 1 0 1 0 1 0 11 0 1 0 1

#include <stdio.h>int main(){ int i, j; for(i=1;i<=4;i++) { for(j=i;j>=1;j--) { printf("%d",j%2); }

printf("\n");

}return 0;

}

5 4 3 2 14 3 2 13 2 12 11

#include<stdio.h>#include <stdio.h>int main(){ int i, j; for(i=5;i>=1;i--) { for(j=i;j>=1;j--) { printf("%d",j); } printf("\n"); } return 0;}

   1 A B 2 3 4 C D E F5 6 7 8 9

#include<stdio.h>#include<conio.h>void main(){ int rno=0,i,j,k,no1=1,ch1=65,count=0;

clrscr();printf("Enter the number of rows you want:");scanf("%d",&rno);for(i=1;i<=rno;i++){

count++;for(k=rno-i;k>=1;k--){

printf(" ");}if(i%2==0){

for(j=1;j<=count;j++){

printf("%c ",ch1);ch1++;

}}else{

for(j=1;j<=count;j++){

printf("%d ",no1);no1++;

}}printf("\n");

} getch();}

PRACTICAL SET-5:

5.1. Write a program for following Series: 1 + 3 + 5 +… + n

#include<stdio.h>#include<conio.h>void main(){int n,result;int addTotal(int);clrscr();printf("enter any number: ");scanf("%d",&n);result=addTotal(n);printf("\nThe sum 1 to n is %d",result);getch();}int addTotal(int m){int sum=0,i;for(i=1;i<=m;i++){             if(i%2==1)    sum= sum + i;}return sum;}

5.2. Write a program for following Series: 13 + 23 + 33 + 43 … + n3

#include<stdio.h>#include<math.h>

int main(){

int n,i; int sum=0;

printf("Enter the n i.e. max values of series: "); scanf("%d",&n);

sum = pow(((n * (n + 1) ) / 2),2);

printf("Sum of the series : ");

for(i =1;i<=n;i++){ if (i != n) printf("%d^3 + ",i); else printf("%d^3 = %d ",i,sum); } return 0;}

5.3. Write a Program to print Fibonacci series.(1 1 2 3 5 8 13……)

 #include<stdio.h> int main(){  int n, first = 0, second = 1, next, i;   printf("Enter the number of terms\n");  scanf("%d",&n);   printf("First %d terms of Fibonacci series are :-\n",n);   for ( i = 0 ; i < n ; i++ )  {     if ( i <= 1 )        next = i;     else     {        next = first + second;        first = second;        second = next;     }

     printf("%d\n",next);  }  return 0;}

5.4. Write a program to print 1+1/2+1/3+1/4+………+1/N series. 

#include<stdio.h>#include<conio.h>void main(){double n,sum=0,i;clrscr(); printf("\n Please Give The Value of N:  ");scanf("%lf",&n);for(i=1;i<=n;i++){ sum = sum + (1/i); if(i==1) printf("\n 1 +"); elseif(i==n) printf(" (1/%d)  ",i); else printf(" (1/%d) + ",i);}printf("\n\n THE SUM OF THIS SERIES IS %.2lf",sum);getch();}

PRACTICAL SET-6:

6.1 Write a program to display Sum and average of any 10 no. using 1-D Array.

#include<stdio.h>#include<conio.h>

void main(){int arr[10];int i,sum=0,avg=0;clrscr();

for(i=0;i<10;i++){ scanf("%d",&arr[i]); sum = sum + arr[i];}

printf("\n Sum of array elements = %d",sum);

avg = sum/10;

printf("\n Average = %d",avg);getch();}

6.2 Write a Program to Find largest odd number from given 1-D Array.

#include<stdio.h>void main(){int array[10],temp, i, num;clrscr();printf("Enter the size of an array \n");scanf("%d", &num);printf("Enter the elements of the array \n");for (i = 0; i<num; i++){ scanf("%d", &array[i]);}printf("\n Odd numbers in the array are::");for (i = 0; i<num; i++){ if (array[i] % 2 != 0) {

printf("%d \t", array[i]); } temp=array[0];}for (i = 0; i<num; i++){ if(array[i]>=temp) {

temp=array[i]; }}printf("\nThe Largest Odd Number::%d",temp);getch();}

6.3 Write a program to read array of integers and print it in reverse order

#include<stdio.h>#include<conio.h>int main() {int arr[30], i, j, num, temp;

printf("\nEnter no of elements : "); scanf("%d", &num); //Read elements in an array for (i = 0; i < num; i++) { scanf("%d", &arr[i]); } j = i - 1; // j will Point to last Element i = 0; // i will be pointing to first element while (i < j) { temp = arr[i]; arr[i] = arr[j]; arr[j] = temp; i++; // increment i j--; // decrement j } //Print out the Result of Insertion printf("\nResult after reversal : "); for (i = 0; i < num; i++) { printf("%d \t", arr[i]); } return (0);}

6.4 Write a program to Sort given Array in Descending Order.

#include<stdio.h>void main (){ int number[30]; int i, j, a, n; printf("Enter the value of N\n"); scanf("%d", &n); printf("Enter the numbers \n"); for (i = 0; i < n; ++i) scanf("%d", &number[i]); /*...sorting begins ... */

for (i = 0; i < n; ++i) { for (j = i + 1; j < n; ++j) { if (number[i] < number[j]) { a = number[i]; number[i] = number[j]; number[j] = a;

} } }printf("The numbers arranged in descending order are given below\n");for (i = 0; i < n; ++i) { printf("%d\n", number[i]); }return 0;}

6.5 Write a program to Add two Matrices. i.e. C= A + B

#include<stdio.h>

int main(){ int m,n,c,d,first[10][10],second[10][10],sum[10][10]; printf("Enter the number of rows and columns of matrix\n"); scanf("%d%d", &m, &n); printf("Enter the elements of first matrix\n"); for (c = 0; c < m; c++) for (d = 0; d < n; d++) scanf("%d", &first[c][d]); printf("Enter the elements of second matrix\n"); for (c = 0; c < m; c++) for (d = 0 ; d < n; d++) scanf("%d", &second[c][d]); printf("Sum of entered matrices:-\n"); for (c = 0; c < m; c++) { for (d = 0 ; d < n; d++) { sum[c][d] = first[c][d] + second[c][d]; printf("%d\t", sum[c][d]); } printf("\n"); } return 0;}

6.6 Write a program to Multiply two 3X3 Matrices. i.e. C= A * B

#include<stdio.h>int main() { int a[10][10], b[10][10], c[10][10], i, j, k; int sum = 0; printf("\nEnter First Matrix : n"); for (i = 0; i < 3; i++) { for (j = 0; j < 3; j++) { scanf("%d", &a[i][j]); } } printf("\nEnter Second Matrix:n"); for (i = 0; i < 3; i++) { for (j = 0; j < 3; j++) { scanf("%d", &b[i][j]); } } //Multiplication Logic for (i = 0; i <= 2; i++) { for (j = 0; j <= 2; j++) { sum = 0; for (k = 0; k <= 2; k++) { sum = sum + a[i][k] * b[k][j]; } c[i][j] = sum; } } printf("\nMultiplication Of Two Matrices : \n"); for (i = 0; i < 3; i++) { for (j = 0; j < 3; j++) { printf(" %d ", c[i][j]); } printf("\n"); } return (0);}

PRACTICAL SET-7:

7.1 Write a program to Find String Length without using inbuilt function.

#include<stdio.h>void main(){ char string[50]; int i, length = 0; printf("Enter a string \n");

gets(string);/*keep going through each character of the string till its end */ for (i = 0; string[i] != '\0'; i++) { length++; }printf("The length of %s = %d\n", string, length);getch();}

7.2 Write a program to Count no. of Vowels in given String.

#include<stdio.h>void main(){ char sentence[80]; int i, vowels = 0, consonants = 0, special = 0; printf("Enter a sentence \n"); gets(sentence); for (i = 0; sentence[i] != '\0'; i++) { if ((sentence[i] == 'a' || sentence[i] == 'e' || sentence[i] == 'i' || sentence[i] == 'o' || sentence[i] == 'u') || (sentence[i] == 'A' || sentence[i] == 'E' || sentence[i] == 'I' || sentence[i] == 'O' || sentence[i] == 'U')) { //vowels = vowels + 1; ++vowels; }} printf("No. of vowels in %s = %d\n", sentence, vowels); getch();}

7.3 Write a program to append one string to another String.

#include<stdio.h>void main(void){ char str1[25],str2[25]; int i=0,j=0; printf("\nEnter First String:"); gets(str1); printf("\nEnter Second String:"); gets(str2);

while(str1[i]!='\0') i++; while(str2[j]!='\0') { str1[i]=str2[j]; j++; i++; } str1[i]='\0'; printf("\nConcatenated String is %s",str1);}

7.4 Write a program to check whether given String is Palindrome or not.

#include <stdio.h>#include <string.h>int main(){ char string1[20]; int i, length; int flag = 0; printf("Enter a string:"); scanf("%s", string1); length = strlen(string1); for(i=0;i < length ;i++){ if(string1[i] != string1[length-i-1]){ flag = 1; break;

}}

if(flag) { printf("%s is not a palindrome", string1); } else { printf("%s is a palindrome", string1); } return 0;}

7.5 Write a program to copy one string to another string

#include<stdio.h>int main(){ char s1[100], s2[100], i; printf("Enter string s1: ");

scanf("%s",s1); for(i=0; s1[i]!='\0'; ++i) { s2[i]=s1[i]; } s2[i]='\0'; printf("String s2: %s",s2); return 0;}

7.6 Write a program to count no of words in a sentence.

#include<stdio.h>#include<string.h> void main(){ char s[200]; int count = 0, i; printf("enter the string\n"); scanf("%[^\n]s", s); for (i = 0;s[i] != '\0';i++) { if (s[i] == ' ') count++; } printf("number of words in given string are: %d\n", count + 1);}

7.7 Write a program convert character into TOggLe character.

#include<stdio.h>#include<conio.h>int main(){ char ch; printf("Enter any character : "); scanf("%ch", &ch); if(ch>='A' && ch<='Z') ch=ch+32; else if(ch>'a' && ch<='z') ch=ch-32; printf("Convert case of character : %c",ch); getch();

return 0;}

PRACTICAL SET-8:

8.1 Write a Program using function to Add 1st n numbers and also Find out Average of 1st n numbers. (Where n is enter through Keyboard.)

#include<stdio.h>int add(int x){ int sum=0,i=1; for(i=1;i<=x;i++) { sum=sum+i; }return sum; }void main (){ int no,sum=0; float avg; clrscr(); printf("Please Enter the No:"); scanf("%d",&no); sum=add(no); avg=(float)sum/(float)no; printf("\nSum Up to Given Number is:%d",sum); printf("\nAvg of Sum Up Given Number is:%f",avg); getch();}

8.2 Write a Program using function to Find out Cube of any given number N.

#include<stdio.h>#include<conio.h>void cube();void main(){ int no; clrscr(); printf("Enter the number for Cubic::"); scanf("%d",&no); cube(no); getch();}void cube(int x){

int ans; ans=x*x*x; printf("\n Cube of given num:: %d",ans);}

8.3 Write a Program using function to Find out Factorial of given number with and without recursion.

//using recursion#include<stdio.h>int factorial(int);void main(){ int n,ans=0; clrscr(); printf("Enter an positive integer: "); scanf("%d",&n); ans=factorial(n); printf("Factorial of %d = %d", n, ans); getch();}int factorial(int x){ if(x==1) {

return 1; } else {

return (x*factorial(x-1)); }}

//Without using recursion#include<stdio.h>#include<conio.h>void fact(int);void main(){

void fact();clrscr();printf("Enter the value of n:: ");scanf("%d",&n);fact(n);getch();

}void fact(int x){

int i,ans=1;

for(i=1;i<=x;i++){

ans=ans*i;}printf("\n Factorial of %d is %d",x,ans);

}

8.4 Write a calculator program (add, subtract, multiply, divide). Prepare user defined function for each functionality.

#include<stdio.h>#include<conio.h>void Add(int,int);void Subtract(int,int);void Multiply(int,int);void Divide(int,int);void main(){ int a,b; clrscr(); print(“Enter two Numbers”); scanf(“%d%d”,&a,&b); Add(a,b); Subtract(a,b); Multiply(a,b); Divide(a,b); getch();}void Add(int a,int b){ printf(“add:%d”,a+b);}void Subtract(int a,int b){ printf(“Sub:%d”,a-b);}void Multiply(int a,int b){ printf(“Mul:%d”,a*b);} void Divide(int a,int b){ printf(“Div:%d”,a/b);}

8.5 Write a function prime that return 1 if it‘s argument is prime and return 0 otherwise.

#include<stdio.h>

#include<conio.h>void main(){ int prime(int n); int i,n; clrscr(); printf("\n Enter the number::"); scanf("%d",&n); i=prime(n); if(i==1)

printf("The number is prime"); else

printf("The number is not prime"); getch();}int prime(int n){

int j,check=0;for(j=2;j<n;j++){

if(n%j==0){

return(0);check=1;break;

}}if(check==0) return(1);

}

PRACTICAL SET-9:

9.1 Write a program to print an address of a variable.

#include<stdio.h>#include<conio.h>void main(){ int x,*p; clrscr(); x=10; p=&x; printf("\nAddressof variable x is %u",p);

getch();}

9.2 Write a program to change the value of a variable using pointer.

#include<stdio.h>#include<conio.h>void main(){ int x,*p; clrscr(); x=10; p=&x; *p=20; printf("\n x = %d",x);getch();}

9.3 Write a program using pointer to compare two strings.

#include<stdio.h>int compare_string(char*, char*); main(){ char first[100], second[100], result; printf("Enter first string\n"); gets(first); printf("Enter second string\n"); gets(second); result = compare_string(first, second); if (result == 0) printf("Both strings are same.\n"); else printf("Entered strings are not equal.\n"); return 0;} int compare_string(char *first, char *second){ while(*first==*second) { if ( *first == '\0' || *second == '\0' ) break; first++; second++; } if( *first == '\0' && *second == '\0' )

return 0; else return -1;}

9.4 Write a program using pointer to read an array of integer and print elements in reverse order.

#include<stdio.h>#include<conio.h>void main(){ int *ptr,i,n; clrscr(); printf(“Enter the no of elements:”); scanf(“%d”,&n);

for(i=0; i<n; i++) { printf(“Enter %d element : “,i+1); scanf(“%d”,&ptr[i]); } printf(“Array in reverse order\n”); for(i=n-1; i>=0; i–) printf(“%d\n”,ptr[i]);getch();}

9.5 Write a program using pointer to copy one string to another string.

#include <stdio.h>void main(){ char s1[100], s2[100], i; printf("Enter string s1: "); scanf("%s",s1); for(i=0; s1[i]!='\0'; ++i) { s2[i]=s1[i]; } s2[i]='\0'; printf("String s2: %s",s2); getch();}

PRACTICAL SET-10:

10.1 Define a structure called cricket that will describe the following information: a. Player name b. Team name c. Batting average

#include<stdio.h>#include<conio.h>#include<string.h>#define total 2struct cricket{ char nm[20],team[20]; int avg;}; int main(){ struct cricket player[total],temp; int i,j; clrscr(); for(i=0;i<total;i++) { printf("For player %d\n",i+1); printf("Enter the name of player : "); fflush(stdin); gets(player[i].nm); printf("Enter the team : "); fflush(stdin); gets(player[i].team); printf("Enter the batting average : "); fflush(stdin); scanf("%d",&player[i].avg); } printf("\nTeam Name Average\n"); printf(" \n"); for(i=0;i<total;i++) { printf("%-10s %-10s %7d\n", player[i].team, player[i].nm,player[i].avg); } getch();}

10.2 Write a function to enter Roll no, marks of the three subject for 3 student and find total obtained by each student.

#include<stdio.h>#include<conio.h>void main(){struct student

{ int rollno; char name[20]; int m1,m2,m3;};struct student s[20],t;int i,j,n;clrscr();printf("\n enter the limit");scanf("%d",&n);for(i=0;i<n;i++){ printf("\n enter the roll no\n"); scanf("%d",&s[i].rollno); printf("\n enter the name \n"); scanf("%s",s[i].name); printf("\n enter the mark1="); scanf("%d",&s[i].m1); printf("\n enter the mark2="); scanf("%d",&s[i].m2); printf("\n enter the mark3="); scanf("%d",&s[i].m3);}for(i=0;i<n;i++){ printf("\n rollno=%d",s[i].rollno); printf("\n name=%s",s[i].name); printf("\n mark1=%d",s[i].m1); printf("\n mark2=%d",s[i].m2); printf("\n mark3=%d",s[i].m3);}getch();}

PRACTICAL SET-11:

11.1 Write a program that uses a table of integers whose size will be specified interactively at run time.

#include<stdio.h>#include<stdlib.h>void main(){ int *p, *table; int size; printf("\nWhat is the size of table?"); scanf("%d",&size); printf("\n");

if((table = (int*)malloc(size *sizeof(int))) == 0) { printf("No space available \n"); exit(1); } printf("\n Address of the first byte is %u \n", table); /* Reading table values*/ printf("\nInput table values\n"); for (p=table; p<table + size; p++) scanf("%d",p); /* Printing table values <span id="IL_AD3" class="IL_AD">in reverse</span> order*/ for (p = table + size -1; p >= table; p --) printf("%d is stored at address %u \n",*p,p); getch();}

11.2 Write a program to store a character string in block of memory space created by malloc and then modify the same to store a large string.

#include<stdio.h>#include<stdlib.h>#define NULL 0void main(){ char *buffer; /* Allocating memory */ if((buffer = (char *)malloc(10)) == NULL) { printf(“malloc failed.\n”); exit(1); } printf(“Buffer of size %d created \n”,_msize(buffer)); strcpy(buffer, “HYDERABAD”); printf(“\nBuffer contains: %s \n “, buffer); /* Realloction */ if((buffer = (char *)realloc(buffer, 15)) == NULL) { printf(“Reallocation failed. \n”); exit(1); } printf(“\nBuffer size modified. \n”); printf(“\nBuffer still contains: %s \n”,buffer); strcpy(buffer, “SECUNDERBAD”); printf(“\nBuffer now contains: %s \n”,buffer);

/* Freeing memory */ free(buffer); return 0;}

PRACTICAL SET-12:

12.1 Write a program to create a file and perform basic I/O operations on the same.

// Writing to a file

#include <stdio.h>int main(){ int n; FILE *fptr; fptr=fopen("C:\\program.txt","w"); if(fptr==NULL){ printf("Error!"); exit(1); } printf("Enter n: "); scanf("%d",&n); fprintf(fptr,"%d",n); fclose(fptr); return 0;}

// Reading from file

#include <stdio.h>int main(){ int n; FILE *fptr; if ((fptr=fopen("C:\\program.txt","r"))==NULL){ printf("Error! opening file"); exit(1); /* Program exits if file pointer returns NULL. */ } fscanf(fptr,"%d",&n); printf("Value of n=%d",n); fclose(fptr); return 0;}

12.2 Write a program to illustrate the use of fputc(), fputs(), and fgets()

Program for fgets():-#include<stdio.h>#include<stdlib.h>int main(){ FILE *fp; char str[60]; /* opening file for reading */ fp = fopen("file.txt" , "r"); if(fp == NULL) { perror("Error opening file"); return(-1); } if( fgets (str, 60, fp)!=NULL ) { /* writing content to stdout */ puts(str); } fclose(fp); return(0);}

Program for fputs():-#include<stdio.h>#include<stdlib.h>int main() { FILE *fptr; char text[100]; int i=0; clrscr(); printf(“Enter a text:\n”); gets(text); if((fptr = fopen(“TEST”,”w”))==NULL) { printf(“Cannot open file\n”); exit(1); } fputs(text,fptr); if(fclose(fptr)) printf(“File close error\n”); getch(); return 0; }

Program for fputc():-#include<stdio.h>#include<stdlib.h>int main() {

FILE *fptr; char text[100]; int i=0; clrscr(); printf(“Enter a text:\n”); gets(text); if((fptr = fopen(“TEST”,”w”))==NULL) { printf(“Cannot open file\n”); exit(1); } while(text[i]!=’\0’) fputc(text[i++],fptr); if(fclose(fptr)) printf(“File close error\n”); getch(); return 0; }