c - 我在 C 中的开关(在 while 循环内)在正常运行之前直接进入默认状态

Question

这是有问题的 while 循环和开关(track1 定义了一个更大的循环，此处未显示):

while (track6 ==1)
    {
    printf ("would you like to play again? Y or N?\n");
    scanf ("%c", &response);

        switch (response)
            {
            case 'Y' : track6 = 2; 
                break;
            case 'N' : printf ("thanks for playing!\n");
                            track6 = 2, track1 = 2;
                break;
                    default : printf ("response is case-sensitive and must be either Y or N. your response is invalid. please reenter.\n");
            }
    }

我收到的输出是:

would you like to play again? Y or N?

response is case-sensitive and must be either Y or N. your response is invalid. please  reenter.

would you like to play again? Y or N?

(提示输入然后正确执行)

似乎它正在执行第一个 printf，跳过 scanf，执行默认值，回到循环顶部并从那里正常运行。知道为什么吗？这只是我的第 3 周编程，所以非常感谢外行人的术语。

Answer 1

我认为这是 scanf 的问题，因为它首先读取输入 - 尝试 getchar() 或在 scanf 中添加一个空格字符，例如 "%c"

scanf (" %c", &response);