Nested While Loop: C Program

In this video tutorial we’ll demonstrate the use of nested while loop in C programming.

Related Read:
C Program to print Armstrong Numbers between 1 and 500

Number of Iterations In Nested Loops
Number of iterations will be equal to the number of iterations in the outer loop multiplied by the number of iterations in the inner loop.

Nested While Loop: C Program

Source Code: Single While Loop: C Program

#include < stdio.h >

int main()
{
    int count1 = 1;

    while(count1 <= 5)
    {
        printf("%d\n", count1);
        count1++;
    }

    return 0;
}

Output:
1
2
3
4
5

Source Code: Nested While Loop: C Program

#include < stdio.h >

int main()
{
    int count1 = 1, count2;

    while(count1 <= 5)
    {
        printf("%d\n", count1);
        count2 = 2;

        while(count2)
        {
            printf("   %d\n", count2);
            count2--;
        }

        count1++;
    }

    return 0;
}

Output:

1
   2
   1
2
   2
   1
3
   2
   1
4
   2
   1
5
   2
   1

For every single iteration of the outer while loop, the inner while loop completes its iterations.

A loop inside another loop is called a nested loop. Consider a nested loop where the outer loop runs x times and consists of another loop inside it. The inner loop runs y times. Then, the total number of times the inner loop runs during the program execution is x*y times.

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