//Libraries used
#include <iostream>
#include <fstream>
using namespace std

void main()
{
	//Varaible Declaration
	ifstream fin;
	int InputGrade, grades[5] = { 0 }, sum = 0, count = 0;

	// Welcome message
	cout << "---------------------------------------------\n"
		<< "      Mihai's Grades Satistics Evaluator \n"
		<< "---------------------------------------------\n\n";

	//Opening input file (with all the grades to be processed)
	fin.open("A4Q3.dat");

	//Extracting each grade from file
	fin >> InputGrade
		while (fin) //while reading file
		{
			if (InputGrade >= 90) // grades[0] is an array counting the number of grades >= 90
				grades[0]++;
			else if (InputGrade >= 80) //grades[1] " " " " >= 80
				grades[1]++;
			else if (InputGrade >= 65) //...
				grades[2]++;
			else if (InputGrade >= 50) //...
				grades[3]++;
			else if (InputGrade < 50) //...
				grades[4]++;
			count++; //count tracks the total number of grades inputted
			sum += InputGrade; //sum tracks the total of the grades added up
		}

	cout << "Class Average is: " << (sum / count) << "\n" //prints class average (total divided by the number of grades)
		<< "Grades >= 90: " << setprecision(3) << (grades[0] * 1.0 / count) * 100 << "% \n" //prints percentage of grades >= 90 ( # of grades * 1.0 (for double) / ( total # of grades) * 100 (for percentage)
		<< "Grades >= 80: " << setprecision(3) << (grades[1] * 1.0 / count) * 100 << "% \n" //..
		<< "Grades >= 65: " << setprecision(3) << (grades[2] * 1.0 / count) * 100 << "% \n"
		<< "Grades >= 50: " << setprecision(3) << (grades[3] * 1.0 / count) * 100 << "% \n"
		<< "Grades <  50: " << setprecision(3) << (grades[4] * 1.0 / count) * 100 << "% \n" //..
		<< "Thank you! \n";

	InputGrades.close();
}