Thread: checkers game finally finished

Originally Posted by cooper1200

here is the truth table generated

Code:

//column |  row  | good square
//    odd  |  odd  |   place piece
//    odd  | even | invalid square
//   even |  odd  | invalid square
//  even  | even | place piece

i guess having written that out i can use:

Code:

if (((i % 2 == 0) && (j  % 2 == 0)) || ((i % 2 != 0) && (j % 2 !=  0)))
{
       board[i][j] = valid_square;
)
else
{
        board[i][j] = invalid_square;
}

If you had the trouble building the truth table, should have notice that this function could be simplified to a simple XOR:

Code:

board[i][j] = ( ( i % 2) ^ ( j % 2 ) ) ? invalid_square : valid_square;

Or, even better:

Code:

board[i][j] = ( ( i ^ j ) & 1 ) ? invalid_square : valid_square;

i have trouble with pointers i did just read the chapter on bit operations last night however i think of understand more nuclear physics than whats going on there ( it seems contrary to electronic and / or gates) I have seen similar look that was on my face on drunks trying to hold a conversation with their reflection in a shop window and not understanding why they aren't being answered.