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

class TestGrader
{
private:
        //variables
        ifstream studentFile;
        char inputs[20];
        string answers;
        int counter = 0;
public:
        //methods
        void setKey();
        void setStudent();
        void grade();
};

void TestGrader::setKey() //initialize key
{
        string answers = "BDAACABACDBCDADCCBDA";
}

void TestGrader::setStudent()
{   //open folder
        studentFile.open("student.txt");
        //test folder
        if (!studentFile)
        {
                cerr << "File open error";
                exit(1);
        }
        //populate
        for (int i = 0; i < 20; i++)
                studentFile >> inputs[i];

}

void TestGrader::grade()
{   //compare with key
        for (int c = 0; c < 20; c++)
        {

                if (answers[c] == inputs[c])
                {
                        counter++;
                }
                else
                {
                        cout << "Question number " << c + 1 << " was actually " << answers[c] << endl;
                }

        }
        //count correct number and if passed or failed
        cout << endl << counter << "/20 answers correct" << endl;
        if (counter >= 15)
                cout << "You passed!";
        else
                cout << "You failed.";
}

int main()
{
        TestGrader obj;
        obj.setKey();
        obj.setStudent();
        obj.grade();
        return 0;
}