Question

 if(y-- > 0 && matriz[x][y--]!=9 && matriz[x][y--]!=0)

When i’m doing this, my variable y is not decremented, right? And i can do this comparison y– > 0?

Imagine that i have y=0, i want to compare if -1 > 0.

Thanks

Answer 1

Assuming all tests pass, your code is effectively equivalent to this:

if (y > 0)
{
    y--; // post-decrement

    if (matriz[x][y] != 9)
    {
        y--; // post-decrement

        if (matriz[x][y] != 0)
        {
            y--; // post-decrement

            // all true
        }
    }
}

If any fail, you still decrement (equivalence would be in an else-clause), but I’m omitting that for brevity.

Hopefully this is enough to clarify. I find it quite unwieldy, and if y < 2 at the start you’ll end up with a negative index, which is probably a bad thing.