~cpp
#include<iostream>
using namespace std;
void main(){
int i;
char a[5] ={0,};
do{
cout << "점수 입력:";
cin >> i;
if(i==999) continue;
else if(i<0 || i>100){
cout << "잘못 했습니다 다시 해주세요" <<endl; continue;
}
switch(i/10){
case 10:
case 9: a[0] +=1; break;
case 8: a[1] +=1; break;
case 7: a[2] +=1; break;
case 6: a[3] +=1; break;
default: a[4] +=1; break;
}
}while(!(i==999));
for(i=0;i<4;i++)
printf("%c:%d명\n",'A'+i,a[i]);
printf("F:%d명\n",a[4]);
}