作业三-5应用分支与循环结构解决问题——输入五级成绩

#include <stdio.h>
int main(void)
{
    char ch;
    printf("输入成绩：");
        ch=getchar();
    switch(ch){    
  case 'A':
                 printf("90-100
");
     break;
  case 'B':
                 printf("80-89
"); 
     break;
  case 'C':
                 printf("70-79
");
     break;
  case 'D':
        printf("60-69
");
     break;
  case 'E':
        printf("0-59
");
     break;
  default:
                printf("Invalid input
");
    break;
    }
    return 0;
}