switch case

#include <stdio.h>
int main()
{
int score;
int value;
scanf("%d",&score);
value = score/10;
switch(value)
{
case 10:
printf("grade='A'\n");
break;
case 9:
printf("grade='A'\n");
break;
    case 8:
printf("grade='B'\n");
break;
    case 7:
printf("grade='C'\n");
break;
    case 6:
printf("grade='D'\n");
break;
    default:
printf("grade='E'\n");
break;

}

}