DO...WHILE LOOPS

do...while loops in c programming

Loops are used in programming to repeat a specific block of code. After reading this tutorial, you will learn how to create a while and do...while loop in C programming.

Loops are used in programming to repeat a specific block until some end condition is met. There are three loops in C programming:

1. for loop
2. while loop
3. do...while loop

while loop

The syntax of a while loop is:

while (testExpression) 
{
    //codes 
}

where, testExpression checks the condition is true or false before each loop.

example

// Program to find factorial of a number
// For a positive integer n, factorial = 1*2*3...n

#include <stdio.h>
int main()
{
    int number;
    long long factorial;

    printf("Enter an integer: ");
    scanf("%d",&number);

    factorial = 1;

    // loop terminates when number is less than or equal to 0
    while (number > 0)
    {
        factorial *= number;  // factorial = factorial*number;
        --number;
    }

    printf("Factorial= %lld", factorial);

    return 0;
}

Output

Enter an integer: 5
Factorial = 120