Codeup 1068 - 정수 1개 입력받아 평가 출력하기.

#include<iostream>

using namespace std;

int main()
{
   
   int a;

   cin >> a;

   if(a >= 90)
      cout << "A" << endl;

   else if(a < 90 && a >= 70)
      cout << "B" << endl;

   else if(a < 70 && a >= 40)
      cout << "C" << endl;

   else if(a < 40)
      cout << "D" << endl;


   return 0;
}