// C3_6.cpp : Defines the entry point for the console application.
//
// 輸出控制

#include "stdafx.h"
#include <iostream>
using namespace std;

int main(int argc, char* argv[])
{
  int a, b, c, sum ;
  float avg;
  cout << "請輸入國文 英文 數學 3 科成績: ";
  cin >> a >> b >> c;
  cout << endl
       << "國文 "<< a << "英文" << b << " 數學 " << c
       << endl;
  sum = a+b+c;
  cout << sum << endl;
  avg = (a+b+c)/3;
  cout << avg << endl;
  if(avg >= 80)
	  cout << "A" << endl;
  else if (avg >=60 && avg < 80)
	  cout << "B" << endl;
  else
	  cout << "F" << endl;
  return 0;
}