Question

自从我用C语言编写任何东西已经有一段时间了，所以我需要一些帮助。以下代码有某种错误。当我运行代码时，会跳过if和else if，并在屏幕上显示我的硬编码错误。

void play_tictactoe()
{
int row = 0, column = 0, i, win = 0;
char letter = 0;
char board[3][3] =
{
    {' ',' ',' '},
    {' ',' ',' '},
    {' ',' ',' '}
};

printf( "\nDo you want to be X or O: " );
scanf( "%c", &letter );

if( letter == 'x' || letter == 'X' )
{
    for( i = 0; i > 9 && win == 0; i++ )
    {
        printf( "\nPlace X: Row 1-3 and Column 1-3 (i.e. 1,3 for Row 1 and Column 3): " );
        scanf( "%i,%i", &row, &column );

        do
        {
            playersTurnX( &row, &column, board );
            computersTurnX( &row, &column, board );
        }
        while( row > 3 || column > 3);
    }
}
else if( letter == 'o' || letter == 'O' )
{
    for( i = 0; i > 9 && win == 0; i++ )
    {
        printf( "\nPlace O: Row 1-3 and Column 1-3 (i.e. 1,3 for Row 1 and Column 3): " );
        scanf( "%i,%i", &row, &column );

        do
        {
            //computersTurnO( &row, &column, &board );
            //playersTurnO( &row, &column, &board );
        }
        while( row > 3 || column > 3);
    }
}
else
{
    printf( "\nError!!!!\tInvalid entry.\n" );
}
}

Answer 1

使用时：

hello

您最终会将换行符读入scanf( "%c", &letter );。使用：

使用scanf( " %c", &letter ); // ^^^^ add a space before %c.将确保跳过所有空格字符，并且只有非空白字符将被读入" %c"。

Answer 2

通常你想在％c之前添加一个空格来占用空格：

scanf( " %c", &letter );

有关详细信息，请参阅此处：https://gsamaras.wordpress.com/code/caution-when-reading-char-with-scanf-c/

错误：也许是else if语句？

2 个答案: