Do While Loop in C

Do while loop in C Language:

The do-while loop is a post-tested loop. Using the do-while loop, we can repeat the execution of several parts of the statements. The do-while loop is mainly used in the case where we need to execute the loop at least once. The do-while loop is mostly used in menu-driven programs where the termination condition depends upon the end-user.

Syntax to use Do While Loop in C:

Program to understand do while loop in c:

#include <stdio.h>
int main()
{
    int j=0;
    do
    {
        printf("Value of variable j is: %d\n", j);
        j++;
    }while (j<=3);
    return 0;
}

Output:

Note: When you want to execute the loop body at least once irrespective of the condition, then you need to use the do-while loop.

Nested do-while Loop in C Language:

Using a do-while loop within do-while loops is said to be a nested do-while loop. The syntax to use the nested do-while loop in C language is given below.

Program to Understand Nested do-while Loop in C Language:

#include <stdio.h>
int main ()
{
    do
    {
        printf ("I'm from outer do-while loop ");
        do
        {
            printf ("\nI'm from inner do-while loop ");
        }while (1 > 10);
    }while (2 > 10);
    return 0;
}

Output: