C Nested Loops: Complete Guide with Examples

In C programming language, a nested loop refers to having another loop inside a loop. Nested loops are commonly used for handling multi-dimensional arrays or situations that require multiple iterations.

Here is a simple example demonstrating how to use nested loops in the C programming language.

#include <stdio.h>

int main() {
    int i, j;

    // 嵌套循环，打印九九乘法表
    for(i = 1; i <= 9; i++) {
        for(j = 1; j <= i; j++) {
            printf("%d * %d = %d\t", j, i, i*j);
        }
        printf("\n");
    }

    return 0;
}

In the example above, we used two nested for loops to print the multiplication table of nine. The outer loop controls the number of rows in the table, while the inner loop controls the content of each row of the table.

By using nested loops, we can effectively handle situations with multiple levels of iteration, making the program more efficient and concise.