C Nested Loops

🔁 C Nested Loops – Loop Inside a Loop

In C programming, nested loops mean using one loop inside another. The inner loop runs completely every time the outer loop runs once. They are useful for printing patterns, grids, tables, and more!

🔹 Syntax of Nested Loops

for (int i = 0; i < outerLimit; i++) {
    for (int j = 0; j < innerLimit; j++) {
        // inner loop code
    }
}

📝 Example 1: Simple Nested For Loop

This prints a 3×3 grid of asterisks using nested loops.

#include <stdio.h>

int main() {
    for (int i = 1; i <= 3; i++) {
        for (int j = 1; j <= 3; j++) {
            printf("* ");
        }
        printf("\n");
    }

    return 0;
}
  

📝 Example 2: Printing Row and Column Numbers

This displays the current row and column of each loop iteration.

#include <stdio.h>

int main() {
    for (int row = 1; row <= 2; row++) {
        for (int col = 1; col <= 3; col++) {
            printf("Row %d, Col %d\n", row, col);
        }
    }

    return 0;
}
  

🎯 What You Should Know

• Each time the outer loop runs, the inner loop restarts and completes its cycle.
• Useful for printing number patterns, grids, and solving matrix-related problems.
• You can use for, while, or do-while loops inside each other.

🎉 Practice Challenge

Try printing a triangle pattern using nested loops. Or loop through a 2D array and print each value — have fun looping!