Check if a rectangle is filled

Question

I'm working on a game that makes a 3x3 grid and according to the click of the user it turns it black. There are lots of help on how to draw a rectangle and fill it, but not on how to check and see if the individual rectangles are filled.

I am trying to check if each of the rectangles on the grid that the user sees on screen are filled. I have seen C# like twice in my life, so I would appreciate if someone would point me in the right direction please.

This is what I get so far:

        for (int r = 0; r < NUM_CELLS; r++)
            for (int c = 0; c < NUM_CELLS; c++)
                if(grid[r, c])
                    return true;
                else
                    return false;

Answer 1

You can't return true, or you'll return true if the first element is true.

Try this:

for (int r = 0; r < NUM_CELLS; r++)
{
     for (int c = 0; c < NUM_CELLS; c++)
     {
         if(!grid[r, c])
         {
             return false;
         }
     }
}
return true;