C语言实验--成绩转换

#include<stdio.h> int main() {   int score,t;    while(scanf("%d",&score)!=-1)    {    if(score>100||score<0)       {    printf("Score is error!\n");             continue;           }              t=score/10;           switch(t)              {case 10:               case 9: printf("A\n");break;                case 8: printf("B\n");break;                case 7: printf("C\n");break;             case 6: printf("D\n");break;            case 5:             case 4:              case 3:               case 2:              case 1:             case 0:printf("E\n");break;               default:printf("Score is error!\n");break;              }     }    return 0; }