Program to print series from 10 to 1 using nested loops

What Are Nested Loops?

In C programming, nested loops refer to using one loop inside another loop. The inner loop runs completely for each iteration of the outer loop.

for (int i = 1; i <= n; i++) { // Outer loop
for (int j = 1; j <= m; j++) { // Inner loop
// code to execute
}
}

Nested loops are commonly used for:

• Printing patterns

• Traversing matrices or grids

• Repeating a task multiple times in a structured way

C Program to Print Series from 10 to 1 Using Nested Loops

Let’s now use nested loops to print numbers from 10 to 1, and repeat that series multiple times.

#include <stdio.h>

int main() {
int i, j;

for (i = 1; i <= 3; i++) { // Outer loop: runs 3 times
for (j = 10; j >= 1; j--) { // Inner loop: prints 10 to 1
printf("%d ", j);
}
printf("\n"); // Move to next line after each row
}

return 0;
}

OUTPUT 

10 9 8 7 6 5 4 3 2 1
10 9 8 7 6 5 4 3 2 1
10 9 8 7 6 5 4 3 2 1

Explanation:

• Outer Loop (for (i = 1; i <= 3; i++)):

  • This loop controls how many times the series from 10 to 1 is printed.

  • Runs 3 times to create 3 rows.

• Inner Loop (for (j = 10; j >= 1; j--)):

  • This prints numbers from 10 down to 1.

  • Runs every time the outer loop runs.

• printf("\n");:

  • Moves the output to a new line after each row.

Summary

• Nested loops run in a layered structure: the inner loop completes fully before the outer loop moves to its next iteration.

• This technique is useful for grid printing, pattern problems, and number sequences.

• You can adjust loop conditions to print different shapes, tables, or logic-based outputs.