Example: Upper Triangular Matrix (Hardcoded) in C++

// Upper Triangular Matrix (Hardcoded)
#include <iostream>
using namespace std;

int main() {
    // Step 1: Define a sample 3x3 matrix
    int matrix[3][3] = {
        {1, 2, 3},
        {4, 5, 6},
        {7, 8, 9}
    };

    int rows = 3;
    int cols = 3;

    cout << "Original Matrix:\n";
    for (int i = 0; i < rows; ++i) {
        for (int j = 0; j < cols; ++j) {
            cout << matrix[i][j] << " ";
        }
        cout << endl;
    }

    cout << "\nUpper Triangular Matrix:\n";
    // Step 2: Iterate through the matrix to display its upper triangular form
    for (int i = 0; i < rows; ++i) { // Outer loop for rows
        for (int j = 0; j < cols; ++j) { // Inner loop for columns
            // Step 3: Check if the current element is below the main diagonal
            if (j < i) {
                cout << "0 "; // If below diagonal, print 0
            } else {
                cout << matrix[i][j] << " "; // Otherwise, print original element
            }
        }
        cout << endl; // Move to the next line after each row
    }

    return 0;
}