Arrays Triangular matrices

[fazalhussainakbar]

Kindly recommend alternate for trangular matrices

#include <iostream>

using namespace std;

int main(void)
{
int rows = 5, cols = 5;
int **arr;
// allocate and initialize the array
arr = new int * [rows];
for (int r = 0; r < rows; r++) {
arr[r] = new int[r + 1];
for(int c = 0; c <= r; c++)
arr[r][c] = (r + 1) * 10 + c + 1;
}
// print the array
for(int r = 0; r < rows; r++) {
for(int c = 0; c <= r; c++)
cout << arr[r][c] << " ";
cout << endl;
}
// free the array
for(int r = 0; r < rows; r++)
delete [] arr[r];
delete [] arr;
return 0;
}