程序代码：

#include<stdio.h>
#include<ctype.h>
int main()
{
    char a;
    printf("输入a的字符:");
    while((a=getchar())!='#');
    {
        if(a=='\n')
            continue;  //这里出现了error C2044: illegal continue
        if(islower(a))
         switch(a)
        {
            case'a':printf("aaaa\n");break;
            case'b':printf("bbbb\n");break;
             case'c':printf("cccc\n");break;
             default:printf("输入范围只在a~c\n");
        }
        else
            printf("请输入小写字母\n");
        while(putchar(a)!='\n')
            continue;
            printf("输入#结束\n");
    }
    printf("buy\n");
    return 0;
}