Example: Lower Triangular Matrix example in C++ using for loop

C
C++
C#
Java
Python
PHP
// Lower Triangular Matrix example in C++ for loop
#include <bits/stdc++.h>
#define size 4
using namespace std;

// @Utility function to check lower triangular matrix
int CheckLowerTriangularMatrix(int matrix[size][size]) {
    int i, j;
    for (i = 0; i < size; i++)
        for (j = i + 1; j < size; j++)
            if (matrix[i][j] != 0)
                return 0;
    return 1;
}

// @Driver function to run the program
int main() {
    int matrix[size][size], i, j;

    cout << "The Size of the matrix is: " << size << endl;

    cout << "\nEnter the matrix's elements:\n";
    for(i = 0; i < size; i++) {
        for(j = 0; j < size; j++)
            cin >> matrix[i][j];
        cout << endl;
    }

    if (CheckLowerTriangularMatrix(matrix))
        cout << "This is the Lower Triangular Matrix.\n";
    else
        cout << "This not a Lower Triangular Matrix!\n";

    return 0;
}