#include "stdio.h"
void main()
{
char grade;
printf("please input the grade:");
scanf("c%",grade);
switch(grade)
{
case'A':
printf("[90,100]\n");
case 'B':
printf("[80,90)\n");
break;
case 'C':
printf("[70,80)\n");
break;
case 'D':
printf("[0,60)\n");
break;
default:
printf("input error\n");
}
}