int main(void)

{

int score;

score/=10;

printf("請輸入你的成績");

scanf("%d",&score);

switch(score){

case 10:

case 9:

printf("A\n");

break;

case 8:

printf("B\n");

break;

case 7:

case 6:

printf("C\n");

break;

default:

printf("D\n");

break;

}

return 0;

}