#include <iostream>
#include <string> //include this if you want string variables
#include <fstream> //include if you want to do file IO
using namespace std;


// Write a program that takes 3 grades in, and
// outputs the letter grade based on the average score.
// Also, for fun, ask for their name so you can use it later

int main()
{
	//step 0: Declare some variables
	double grade1;
	double grade2;
	double grade3;
	double average;
	char letterGrade; //A variable for storing a single character
	string name; //string variables store words (i.e. string of characters)

	ifstream infile("gradeBook.txt"); //a variable to read data from a file
	ofstream outfile("letterGrades.txt"); //a variable to write data to a file

	//Replace the cin and cout statements with infile and outfile to do File IO.

	//Step 1: Greet user, tell them what the program is going to do
	cout << "Hello, we are going to calculate your grade! (from your 3 exam scores)" << endl;

	//Step 1.5: Ask for user's name, store in a variable
	//cout << "What's your name? " << endl;
	infile >> name;

	//Step 2: Ask user to enter 3 exam scores, store in 3 variables
	//cout << "Enter 3 exam scores!: " << endl;
	infile >> grade1;
	infile >> grade2;
	infile >> grade3;

	//Step 3: Calculate average score
	average = (grade1 + grade2 + grade3) / 3;

	//Step 4: Determine letter grade
	if (average >= 90)
	{
		//an A!
		letterGrade = 'A';
	}
	else if (average >= 80)
	{
		//a B
		letterGrade = 'B';
	}
	else if (average >= 70)
	{
		//C
		letterGrade = 'C';
	}
	else
	{
		//F
		letterGrade = 'F';
	}

	//Step 5: output the letter grade, use their name
	outfile << "Thank you" << name << endl;
	outfile << "Your letter grade is: " << letterGrade << endl;

	return 0;
}