杭电OJ2004 成绩等级

杭电OJ2004 成绩等级

#include <iostream>
using namespace std;

int main()
{
   int a;
   while(cin>>a)
   {
    if(a<=100 && a>=90)
        cout<<"A"<<endl;
    else if(a<=89 && a>=80)
        cout<<"B"<<endl;
    else if(a<=79 && a>=70)
        cout<<"C"<<endl;
    else if(a<=69 && a>=60)
        cout<<"D"<<endl;
    else if(a<=59 && a>=0)
        cout<<"E"<<endl;
    else
        cout<<"Score is error!"<<endl;
   }

    return 0;
}