程序哪里有问题，请各位看看

Question

#include <stdio.h>
#include <conio.h>
int main()
{
int score,flag;
char grade;
printf("Please input your score:");
scanf("%d",&score);
flag= 0 ;
switch( score%10 )
{
case 10:
case 9: grade='A'; printf("Excellent!\n");continue ;
case 8: grade='B'; printf("Good!\n");break;
case 7: grade='C'; printf("Moderate!\n");break;
case 6: grade='D'; printf("Passed!\n");break;
default: grade='E'; printf("Failed!\n"); flag=1;
}
if( !flag ) printf("You should study harder!\n");
getch();
return 0;
}

Answer 1

#include <stdio.h>
#include <conio.h>
int main()
{
int score,flag;
char grade;
printf("Please input your score:");
scanf("%d",&score);
flag= 0 ;
switch( score%10 )
{
//case 10:        //这句完全没意义，根本可以直接注释掉
case 9: grade='A'; printf("Excellent!\n");/*continue*/break;//continue语句只能在循环中使用，你这里应该跟其他语句一样是break才对
case 8: grade='B'; printf("Good!\n");break;
case 7: grade='C'; printf("Moderate!\n");break;
case 6: grade='D'; printf("Passed!\n");break;
default: grade='E'; printf("Failed!\n"); flag=1;break;//default分支后面这个break可加可不加，我觉得加了格式可读性都更好
}
if( !flag ) printf("You should study harder!\n");
getch();
return 0;
}