C nested while loop

Using While loop within while loops is said to be nested while loop. In nested while loop one or more statements are included in the body of the loop. In nested while loop, the number of iterations will be equal to the number of iterations in the outer loop multiplies by the number of iterations in the inner loop which is most same as nested for loop.

nested while loop Syntax

Let us see how neat a syntax of nested while loop is

while (test condition)
{
while (test condition)
{
.// inner while loop
}
.// outer while loop
}

C program - nested while loop

The following example program will clearly explain the concept of nested while loop

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

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