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

int main()
{
	try {
		const grade lowest;          //defaults to F
		cout << "The lowest grade is " << lowest << ".\n";
		cout << "Its numerical value is " << static_cast<int>(lowest)
			<< ".\n\n";

		const grade highest {"A+"};
		cout << "The highest grade is " << highest << ".\n";
		cout << "Its numerical value is " << static_cast<int>(highest)
			<< ".\n\n";

		const grade a[] {
			{"C"},   //Call constructor to construct a grade object.
			{"B+"},
			{"B"},
			{"B-"},
			{"A"}
		};
		const size_t n {size(a)};  //the number of elements in the array

		int sum {0};
		for (const auto& g: a) {   //g is each grade object in the array
			sum += g;          //means sum = sum + g.operator int();
		}

		grade average {lowest};
		average += sum/n;
		cout << "Average grade in array is " << average << ".\n";
		
		grade next {lowest};
		grade high {highest};

		cout << "The grade now is " << next << "\n"<<"pre fix ++"<<"\n";
		cout << "The next grade is " <<++next << "\n"<<"pre fix --"<<"\n";
		cout << "The next lowest grade is " << --next << "\n\n";
		cout << "An F + 5 is " << next + 5 << "\n";
		cout << "If grade is a C and - 5 should be a : " <<(next + 6) - 5 << "\n\n";
		//
		cout << "The grade now is " << next << "\n";
                cout << "Post Fix++  " << next++ << "\n";
		cout << "New Value "<< next <<  "\n\n";

		cout << "The grade now is  " << high << "\n";
		cout << "Post Fix -- " << high-- <<"\n";
		cout << "New Value: "<< high <<"\n\n";

		if ( next < high ){
			cout << next << " < " << high << "\n";

			cout << "You are failing" << "\n\n";
		}
		if (high > next) {
			cout << high << " > " << next << "\n";

			cout << "You are passing" << "\n\n";
		}
		if (high != next){
			cout << high << " != " << next << "\n";

			cout << "Grades are not the same" << "\n\n";
		}
		grade f1 {"A"};
		grade f2 {"A+"};

		if (f1 <= f2){
			cout << f1 << "<=" << f2 << "\n";
			cout << "Grades are less than or equal" << "\n\n";
		}
		
		grade v1 {"A"};
		grade v2 {"C"};

		if (v1 >= v2){
			cout << v1 << " >= " << v2 << "\n";
			cout << "grades are greater than or equal" << "\n\n";
		}

		if (f1 == v1){
			cout << f1 << " == " << v1 << "\n";
			cout <<"Grades are equal to"<<"\n\n";
		}

		return EXIT_SUCCESS;
	}

	catch(invalid_argument& e) {
		cerr << e.what() << "\n";
		return EXIT_FAILURE;
	}

	catch (range_error& e) {
		cerr << e.what() << "\n";
		return EXIT_FAILURE;
	}

	return EXIT_SUCCESS;   //Arrive here if no exceptions were thrown.
}