C++ 实例 - 输入数字判断成绩

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#include <iostream>
using namespace std;
int main()
{
        int a;
        int x;
        while (true) {
        
        cout<<"请输入数字"<<endl;
        cin>>a;
        if (a<60)
        {
                cout<<"不及格"<<endl;
         }
        else if(a<80)
        {
                cout<<"良好"<<endl;
        }
        else
        {
                cout<<"优秀"<<endl;
        }
        }
        return 0;
}