试题 算法训练 成绩的等级输出

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