#include <stdio.h>

int main(){

int a;

scanf("%d",&a);

if(a>=90&&a<=100){printf("Great");}

else if(a>=70&&a<=89){printf("Good");}

else if(a>=60&&a<=69){printf("Average");}

else if(a>=0&&a<=59){printf("Poor");}

return 0;

}

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;

}

这题还好

#include <iostream>
using namespace std;
int main()
{
    int n = 0;
    cin >> n;
    if(n >= 90) cout << "Great" << endl;
    else if(n >= 70) cout << "Good" << endl;
    else if(n >= 60) cout << "Average" << endl;
    else cout << "Poor" << endl;
    return 0;
}

#include <stdio.h>
#include <algorithm>
#include <math.h>
#include <vector>
using namespace std;
int main() {
   int n;
   scanf("%d",&n);
   if(n>=0&&n<60)
    printf("Poor");
   else
    if(n>=60&&n<70)
    printf("Average");
    else
    if(n>=70&&n<90)
    printf("Good");
     else
    if(n>=90&&n<100)
    printf("Great");
    return 0;
}