Default Values of Function Parameters (P.302)

1. Modify your TETRIS program so that when the function draw_block(i) and erase_block(i) are invoked without specifying the x and y coordinates, the default values would be x=0 and y=0.
2. Add a segment of code in your main program (before the loop which shows the falling down blocks) to test it.

   
       for (i = 1; i <= 7; i++)
       {
   
               draw_block(i);
               myScreen.redraw();
               Sleep(1000); // milliseconds
               erase_block(i);
   
       }