想输入一个字符A，A必须是a~e字母才能符合要求，这样写对吗？

            while(1)
                        {           
                            scanf("%c",&A);                              
                            if(A > 'e'|| A < 'a')
                            {
                            printf("输入错误重新输入:");
                            continue while;   
                            }
                            else
                            {
                            return A;           
                            }
                        }  

while(1)
{           
    scanf("%c",&A);                              
    if(A > 'e'|| A < 'a')
    {
        printf("输入错误重新输入:");
        continue; // while;   
     }
    else
    {
        return A;           
    }
}

while(1)
 {           
    scanf("%c",&A);                              
    if('a' <= A && A <= 'e')
    {
        return A;
    }
 }
这样更好

其实也可以，不过你要知道字符比较的是ASCLL值就行了
另外continue while;  这里while可以去掉，continue是继续循环的意思，不像goto一样
不用指定转到地点

continue;  后面的语句不执行 继续下次循环