刑警的射击成绩

#include <iostream>

using namespace std;

int main()
{
int x,a=0,b=0,c=0,d=0;
do
{
cin>>x;
switch(x)
{
case 0:
case 1:
case 2:
case 3:
case 4:a++;break;
case 5:
case 6:b++;break;
case 7:
case 8:c++;break;
case 9:
case 10:d++;break;
}
}
while(x<=10);
cout<<"A:"<<d<<endl;
cout<<"B:"<<c<<endl;
cout<<"C:"<<b<<endl;
cout<<"D:"<<a<<endl;
return 0;
}