下面的语句为什么执行起来老不成功啊？检查了好几次了，没检查出来什么问题。
main()
{int e;float score;char grade;
printf ("please input score:\n");
scanf ("%f",&score);
if (score>100||score<0) {printf ("data is  error\n");  e=1;}
swith (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';break;}
 if (e==0) printf ("result is %f,grade is %c\n",score,grade);
 getch();}

#include <stdio.h>
void main()
{int e=0;float score;char grade;
printf ("please input score:\n");
scanf ("%f",&score);
if (score>100||score<0) {printf ("data is  error\n");  e=1;}
else
{ int temp = (int)score;
switch (temp/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';break;}
}
if (e==0) printf ("result is %.1f,grade is %c\n",score,grade);
getchar();} 

好好比较比较

#include "stdio.h"
main()
{int e=0;
 float score;
 char grade;
 printf ("please input score:\n");
 scanf ("%f",&score);
 if (score>100||score<0) {printf ("data is  error\n");  e=1;}
 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';break;
  }
 if (e==0) printf ("result is %f,grade is %c\n",score,grade);
 getch();

 }

score为float类型，将其改为int类型即可，也可以按上面两位朋友的方法修改。