#include <iostream> using namespace std; int main(){ int a; cin>>a; if(a>=90&&a<=100){ cout<<"A"; }else if(a>=80&&a<90){ cout<<"B"; }else if(a>=70&&a<80){ cout<<"C"; }else if(a>=60&&a<70){ cout<<"D"; }else{ cout<<"E"; } return 0; }

#include <bits/stdc++.h> using namespace std; int main(){ int a,b,c; cin>>a>>b>>c; if(a>=90){ cout<<"A"; }else if(a>=80&&a<90){ cout<<"B"; }else if(a>=70&&a<80){ cout<<"C"; }else if(a>=60&&a<70){ cout<<"D"; }else{ cout<<"E"; } return 0; }

A450.等级评测