#include <stdio.h>

void main (  )
{        int      day;
        char   raining;

        printf("Enter day (use 1 for Sunday)");
         scanf("%d",&day);
        getchar();
         printf( "Is it raining? (Y/N)");
          scanf("%c", &raining);

        if  ( ( day == 1) || (day == 7) )          // Sat or Sun
        {    if  (raining == 'Y')
                 printf( "Read in bed");
            else
                 printf("Have fun outdoors");
        }
        else
        {     printf(  "Go to class ");
             if  (raining == 'Y')
                   printf( "Take an umbrella");
        }
}

如果去掉getchar()，后面没有判断就直接进入else语句了，为什么啊

明白了，非常感谢！！

可是为什么scanf("%c",&raining)时不先输入，反而是用缓存区里的值呢

明白了