请高手帮忙看一下下面的程序哪里错了：
#include<stdio.h>
int main()
{
float score;
char grade;
printf("please printf your score:");
scanf("%f",&score);
while(score>100||score<0)
{
printf("\nprintf is wrong,please printf again");
scanf("%f",&score);
}
switch((int)(score/10))
{
case10:
case9:grade='A';break;
case8:grade='B';break;
case7:grade='C';break;
case6:grade='D';break;
case5:
case4:
case3:
case2:
case1:
case0：grade='E';
}
printf("the score is %5.1f,the grade is %c\n",score,grade);
return 0;
}
（不考虑英语语法错误）
输入56
运行结果是：
the score is 56.0,the grade is
也就是说运行结果没有输出等级，怎么回事呢？

#include<stdio.h>

int main()
{
    float score;
    char grade;
    printf("please printf your score:");
    scanf("%f",&score);
    while(score>100||score<0)
    {
        printf("\nprintf is wrong,please printf again");
        scanf("%f",&score);
    }
    switch((int)(score/10))
    {
    case 10:
    case 9:grade='A';break;
    case 8:grade='B';break;
    case 7:grade='C';break;
    case 6:grade='D';break;
    case 5:
    case 4:
    case 3:
    case 2:
    case 1:
    case 0:grade='E';
    }
    printf("the score is %5.1f,the grade is %c\n",score,grade);
    return 0;
}

我怀疑你帖的那个能不能编译通过 你编译通过了？

表示只把“：”改成正确的后，一直有E

please printf your score:56
the score is  56.0,the grade is E

please printf your score:99
the score is  99.0,the grade is A

please printf your score:89
the score is  89.0,the grade is B

please printf your score:20
the score is  20.0,the grade is E

上面的那个 运行结果是这样的

认真看 这个冒号和其他的有啥不同

case 0:空格自己吃了.基础很差.

这个有点无语……

#include<stdlib.h>

#include<stdio.h>
int main()
{
float score;
char grade;
printf("please printf your score:");
scanf("%f",&score);
while(score>100||score<0)
{
printf("\nprintf is wrong,please printf again");
scanf("%f",&score);
}
switch((int)(score/10))
{
case10:
case9:grade='A';break;
case8:grade='B';break;
case7:grade='C';break;
case6:grade='D';break;
default:grade='E';
}
printf("the score is %5.1f,the grade is %c\n",score,grade);
    system("pause");
}


稍微改了一下你的代码

我一直都犯小错误，这个需要细心啊，楼主。一定要细心啊，很多问题不是只是问题，是认真度啊，还有汗水。

我想问问啊，只是问问，不是怀疑，你是怎么发现他的错误点在冒号那里的？新手真心不懂啊