算是一道入门题目了

#include <bits/stdc++.h>
using namespace std;
int main(void)
{
    int score;
    cin>>score;
    if((90<=score)&&(score<=100))
    {
        cout<<"Great"<<endl;
    }
    else if ((70<=score)&&(score<=89))
    {
        cout<<"Good"<<endl;
    }
    else if ((60<=score)&&(score<=69))
    {
        cout<<"Average"<<endl;
    }
    else
    {
        cout<<"Poor"<<endl;
    }
    return 0;

}