成绩评级

/*************** *func:成绩评级 ***************/#include<stdio.h>int main(int argc, char *argv[]){    int grade;    do    {        printf("Enter numerical grade:\n");        scanf("%d", &grade);    }while(grade < 0|| grade > 100);     grade /=10;     switch(grade)     {        case 9: printf("Letter grade:A\n"); break;        case 8: printf("Letter grade:B\n"); break;        case 7: printf("Letter grade:C\n"); break;        case 6: printf("Letter grade:D\n"); break;        default:printf("Letter grade:F\n"); break;     }    return 0;}