Example: Print Lower Triangle of a Square Matrix in C

// Print Lower Triangle of a Square Matrix
#include <stdio.h>

int main() {
    // Step 1: Define the size of the square matrix
    int size = 3;

    // Step 2: Declare and initialize the square matrix
    int matrix[3][3] = {
        {1, 2, 3},
        {4, 5, 6},
        {7, 8, 9}
    };

    printf("Original Matrix:\n");
    for (int i = 0; i < size; i++) {
        for (int j = 0; j < size; j++) {
            printf("%d ", matrix[i][j]);
        }
        printf("\n");
    }

    printf("\nLower Triangle of the Matrix:\n");
    // Step 3: Iterate through rows
    for (int i = 0; i < size; i++) {
        // Step 4: Iterate through columns
        for (int j = 0; j < size; j++) {
            // Step 5: Check if the element is in the lower triangle
            if (j <= i) {
                printf("%d ", matrix[i][j]); // Print the element
            } else {
                printf("  "); // Print two spaces for alignment with two-digit numbers if any, or single space.
            }
        }
        printf("\n"); // Move to the next line after each row
    }

    return 0;
}