+ m -= '0';
+ move_result = ttt_board_make_move (&board, m);
+ if (move_result == TTT_ERROR_NOT_GRID)
+ {
+ printf ("Sorry, %c is an invalid move.\n"
+ "Please enter a number between 0 & 8.", m + '0');
+ continue;
+ }
+ if (move_result == TTT_ERROR_NOT_VALID_MOVE)