由于字符变化导致的分段错误

Question

我正在写一个棋盘游戏detailed information。我只是将problem_ch从' '（空格）更改为'.'，从而导致细分错误。当我通过移动和' '进行游戏时，我不会得到，但是当我按照移动进行游戏时，我得到了'.'。我真的真的不明白发生了什么。

  

解决：由于负指数，我得到了分段错误。通过   处理，它解决了。

跟随行动：

3d
2d
5f
2e
1e
4b
4c
4a
3b
at 4b segmentation fault

代码：

void make_move(char board[][SIZE], size_t row, size_t col, char player)
{
    int rowdelta = 0;                     // Row increment
    int coldelta = 0;                     // Column increment
    size_t x = 0;                         // Row index for searching
    size_t y = 0;                         // Column index for searching

    // Identify opponent
    char opponent = (player == player_ch) ? computer_ch : player_ch;

    board[row][col] = player;             // Place the player counter

    // Check all squares around this square for opponents counter
    for(rowdelta = -1 ; rowdelta <= 1 ; ++rowdelta)
        for(coldelta = -1; coldelta <= 1; ++coldelta)
        {
            // Don’t check off the board, or the current square
            if((row == 0 && rowdelta == -1) || row + rowdelta >= SIZE ||
               (col == 0 && coldelta == -1) || col + coldelta >= SIZE ||
               (rowdelta == 0 && coldelta == 0))
                continue;

            // Now check the square
            if(board[row + rowdelta][col + coldelta] == opponent)
            { // Found opponent so search in same direction for player counter
                x = row + rowdelta;           // Move to opponent
                y = col + coldelta;           // square

                for(;;)
                {
                    x += rowdelta;              // Move to the
                    y += coldelta;              // next square


                    if(board[x][y] == problem_ch)      // If square is blank...
                        break;                    // ...give up

                    // If we find the player counter, go backward from here
                    // changing all the opponents counters to player
                    if(board[x][y] == player)
                    {
                        while(board[x -= rowdelta][y -= coldelta] == opponent) // Opponent?
                            board[x][y] = player;                                // Yes, change it

                        break;                      // We are done
                    }
                }
            }
        }
}