Example: MatrixTriangularDisplay in C

// MatrixTriangularDisplay
#include <stdio.h>

#define ROWS 3
#define COLS 3

// Helper function to print a matrix with a given title
void printMatrix(int matrix[ROWS][COLS], const char* title) {
    printf("\n%s:\n", title);
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++) {
            printf("%d ", matrix[i][j]);
        }
        printf("\n");
    }
}

int main() {
    // Step 1: Initialize the matrix
    int matrix[ROWS][COLS] = {
        {1, 2, 3},
        {4, 5, 6},
        {7, 8, 9}
    };

    printMatrix(matrix, "Original Matrix");

    // Step 2: Display Lower Triangular Matrix
    printf("\n--- Displaying Lower Triangular Matrix ---\n");
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++) {
            if (j <= i) { // Elements on or below the main diagonal
                printf("%d ", matrix[i][j]);
            } else { // Elements above the main diagonal
                printf("0 "); // Replace with 0
            }
        }
        printf("\n");
    }

    // Step 3: Display Upper Triangular Matrix
    printf("\n--- Displaying Upper Triangular Matrix ---\n");
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++) {
            if (j >= i) { // Elements on or above the main diagonal
                printf("%d ", matrix[i][j]);
            } else { // Elements below the main diagonal
                printf("0 "); // Replace with 0
            }
        }
        printf("\n");
    }

    return 0;
}