Post on 26-Mar-2015
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ET156 – Introduction to C Programming
Loop Review
The statements within a while loop execute until the loop repetition condition becomes false and might never execute.
Loop Review
Loop Review
A variable used to store a value being computed in increments during a loop’s execution is called an accumulator.
Loop Review
A for loop can either increment or decrement the loop control variable’s value by any
value.
Loop Review
Loop Review
You want to write a program that prompts the user for a value until the user enters -1.
This is an example of a sentinel-controlled loop.
Loop Review
Loop Review
What type of loop always executes at least once?
a. Sentinel-controlled loopb. For loopc. Do-while loopd. Counter-controlled loop
Loop Review
Pointers
A variable that has a memory address as its value is called a pointer.
Process Flow
The process of testing flow of control between a main function and its subordinate functions is called top-down testing.
Integers
Loss of accuracy due to round-off errors may occur when performing mathematical operators with integer values.
a. Trueb. False
ASCII codes
Which of the following characters has the lowest valued ASCII character code?
a. X b. ac. A d. 6
ArraysThe subscript of the first
element in an array is 0.
The Eight Elements of Array x
1-16
Figure 8.2 Arrays answer and score
1-17
Figure 8.3 Program to Print a Table of Differences
1-18
Figure 8.3 Program to Print a Table of Differences (cont’d)
Functions and arrays
A function’s return type cannot be an array.
Function fill_array
Parallel Arrays
You need to store the average rainfall, high temperature, and low temperature for each day in
the year. Average rainfall must be stored as a double. Temperatures must be stored as integers. What type of data structure could you use?
a. Enumerationb. Multidimensional arrayc. Parallel arraysd. Stack
Function to Add Two Arrays
1-23
Function Data Areas for add_arrays(x, y, x_plus_y, 5);
Stacks
When using a stack, all new elements are added to the top of the stack.
Only the top element can be removed from the stack.
Arrays and Flags
A program sets a flag within a loop to indicate when an element has been found in an array. This program is performing a linear search.
All elements in a multidimensional array have the same data type.
int i = 0;myArray[]= {2, 4, 6, 8, 10, 12, 14, 16, 18, 20}while (i < 10){
printf("%d, " myArray[i]);}
Copy this code. What changes are needed to make it work.
The way that it is written, the value 2 will be output infinitely.
What will be the value of y after the following code executes?
int x = 0, n = 2;do
{x *= n + 1;n++;
}while (n < 10);
a. 0 b. 1c. 10 d. 11
You want to write a program that will loop until an event occurs. This is an example of ________________.
a. an accumulator-controlled loop
b. a conditional loop
c. a counter-controlled loop
d. a sentinel-controlled loop
What type of loop always executes at least once?a. Sentinel-controlled loopb. For loopc. Do-while loopd. Counter-controlled loop
A variable that stores a 1 or 0 that is used to indicate whether an
event hasoccurred or not is called?
a. an accumulatorb. a flagc. an increment operatord. a sentinel value
What will be the value of y after the following code executes?
int x = 0, n = 2;
do
{
x *= n + 1;
n++;
}while (n < 10);
a. 0 b. 1 c. 10 d. 11
What will be the value of x after executing the following code? int i, j, x=0;
for (i=0; i< 3; ++i){
for(j=1; j< 2; ++j){x += i * j;}
}a. 0 b. 3 c. 6 d. 9
Assume that age = 18. What will be the output of the following code?
switch (age) {
case 16:
case 17:
printf("Old enough to drive/n");
case 18:
case 19:
case 20:
printf("Old enough to vote/n");
case 21:
printf("Old enough to drink/n");
}
a. Nothingb. Old enough to votec. Old enough to vote Old enough to drinkd. Old enough to drive Old enough to vote Old enough to drink
Assume that price = $4.00. What would be the value of total after executing the following code?
if (price > 100)
shipping = 20;
else if (price < 50)
shipping = 10;
else if (price < 5)
shipping = 0;
if (price > 10)
tax = price * 0.5;
else
tax = price * 0.1;
total = price + tax + shipping;
a. 14.20b. 14.04c. 4.20d. 4.04
a. 0 1 8 27 64 b. 0 1 8 27 64 125c. 0.0 0.0 0.0 0.0 0.0 d. No output
What will the output be when the following code executes?
#define SIZE 5
int main(void)
{ int cubes, i;
for (i=0; i<SIZE; ++i)
{
cubes = i * i * i;
printf(“%f “, cubes);
}
}
a. 1, 2, 3, 4, 5, 6, 7, 8, 9b. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10c. No values will be output.d. The value 0 will be output infinitely.
What will be the output when the code below executes?int i = 0;while (i < 10){ printf(" The value of i is: %d”, i);}
You want to write a program that prompts the user for a value until the user enters -1. This is an example of ________________.
a. an accumulator-controlled loopb. a conditional loopc. a counter-controlled loopd. a sentinel-controlled loop
A for loop _________________________________.a. will never result in an infinite loopb. increases the loop control variable’s value by 1 with every executionc. can increment the loop control variable’s value by any positive incrementd. can either increment or decrement the loop control variable’s value byany value
A variable used to store a value being computed in increments during a loop’s execution is called _____________________.
a. an accumulator
b. a flag
c. an increment operator
d. a sentinel value
The statements within a while loop execute _________________________.
a. at least once and continue executing until the loop repetition conditionbecomes trueb. at least once and continue executing until the loop repetition conditionbecomes falsec. until the loop repetition condition becomes false and might neverexecuted. until the loop repetition condition becomes true and might neverexecute
The controlling expression for a switch statement can be of type
___________.
a. int, char, or double
b. int or double
c. int or char
d. char or double
Using nested if statements is more efficient than using a sequence of if statements.
a. True
b. False