Why does this nested for-loop print this?

Question

I need to figure out how this nested for-loop outputs:

1
2
3
2
4
2
3
5
2
3
4

#include <iostream>
using namespace std;

int main()
{
    int x, y;
    for (x = 1; x <= 5; x++)
    {
      cout << x << endl;
      for (y = 2; y < x; y++)
        cout << y << endl;
    }
}

Answer 1

The problem here is that you don't seem to understand which value is 'x' and which one is 'y':

You can easily understand this by replacing following lines of code:

cout << x << endl;

by

cout << "x: " << x << endl;

And

cout << y << endl;

by

cout << "y: " << x << endl;