#include <iostream>
#include <cstdlib>
using namespace std;

/* Output these 10 lines:
 
X
XX
XXX
XXXX
XXXXX
XXXXXX
XXXXXXX
XXXXXXXX
XXXXXXXXX
XXXXXXXXXX

The variable "row" does two jobs:
1.  It keeps count of which row you're currently outputting, so you don't output
too many rows.
2.  It also controls the length (i.e., the number of X's) of each row.
*/

int main()
{
	int nrows {10};

	for (int row {0}; row < nrows; ++row) {
		//Inner loop outputs a row of row+1 X's, all on the same line.
		for (int col {0}; col <= row; ++col) {
			cout << "X";
		}
		cout << "\n";
	}

	return EXIT_SUCCESS;
}