#include <iostream>  //for the objects cin and cout
#include <cstdlib>   //for the macro EXIT_SUCCESS;
#include "grade.h"   //for class grade
using namespace std;

//You can make this program more robust by having it catch the exceptions that
//might be thrown by the constructor and operator+= of class date.

int main()
{
	const grade  lowest {"F"};   //the lowest  possible grade
	const grade highest {"A"};   //the highest possible grade

	//Loop through all possible grades.
	for (grade g {lowest}; g <= highest; ++g) {
		cout << g << "\n";
	}

	const int distance = highest - lowest;
	cout << "There are " << distance + 1 << " possible grades.\n";
	cout << "The one in the middle is " << lowest + distance/2 << ".\n";

	const grade a[] {
		{"C"},   //Call constructor to construct a grade object.
		{"B+"},
		{"B"},
		{"B-"},
		{"A"}
	};
	const int n {size(a)};   //the number of elements in the array
	int sum {0};
	for (int i {0}; i < n; ++i) {
		sum += a[i];     //sum += a[i].operator int();
	}
	//const int sum {accumulate(a, a+n, 0)};  //#include <algorithm>
	cout << "The average grade was " << lowest + sum/n << ".\n";

	cout << "Please type a grade and press RETURN.\n";
	grade g;
	cin >> g;
	if (!cin) {
		cerr << "Unable to read the grade.\n";
		return EXIT_FAILURE;
	}
	cout << "The grade you typed was " << g << ".\n";

	return EXIT_SUCCESS;
}