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#include <stdio.h>
void main()
{
int k, t;
char grade;
scanf("%d", &k);
if(k==100)
t = 9;
else
t = k/10;
switch(t)
{
case 9:
case 8:
grade='A';
break;
case 7:
grade='B';
break;
case 6:
grade='C';
break;
case 5:
grade='D';
break;
case 4:
case 3:
case 2:
case 1:
case 0:grade='E';break;
default:
break;
}
printf("grade is %c\n", grade);
}