Comparison of arrays created from a class

[slappy5star]

I need to create a program that creates an array of a class object and then compares it to another array (both user input). I am having a problem calling and correctly comparing these arrays and could use some pointers. Here is my code:

Also, any pointers as far as how the rest of the program is built would be appreciated, but I am simply trying to understand how to correctly compare these arrays!

Thanks so much!

#include <iostream>
#include <conio.h>
#include <cctype>
using namespace std;

const int NUM_QUESTIONS = 20;

class TestGrader
{
   private:
       char correctAnswers[NUM_QUESTIONS];
       char studentAnswers[NUM_QUESTIONS];

   public:
       void setKey ();
       void grade (char a[], char b[]);
};

int main ()
{
	char answers = ' ',
		 choices = ' ';
	
	cout << "This program will score your drivers exam.\n";
	cout << "Please enter all answers in capital letters.\n";
	cout << endl;
         
         //creates 2 array objects of size 20
	TestGrader correctAnswers[NUM_QUESTIONS];
	TestGrader studentAnswers[NUM_QUESTIONS];

	correctAnswers[answers].setKey();
	studentAnswers[choices].grade(); //This is where I think I need help!

	return 0;
}

/*********TestGrader::setKey************/
//This function gets the correct answers
//and stores them in an array
void TestGrader::setKey ()
{
    for (int count = 0; count < NUM_QUESTIONS; count++)
    {
         cout << "What is the answer to question #" << (count+1) << ":";
		cin >> correctAnswers[count];
        while (correctAnswers[count] != 'A' && correctAnswers[count] != 'B' && correctAnswers[count] != 'C' && correctAnswers[count] != 'D')
	{
		cout << "You can only enter A, B, C, or D.\n";
		cout << "What is the answer to question #" << count << ":";
		cin >> correctAnswers[count];
	}
	}
}

/**********TestGrader::grade*************/
//This function gets the test takers
//answer and compares them to the key
void TestGrader::grade (char a[], char b[])
{
	int correct = 0;

	for (int count = 0; count < NUM_QUESTIONS; count++)
	{
		cout << "Enter the test takers answer to question #" << (count+1) << ":";
		cin >> studentAnswers[count];
	while (studentAnswers[count] != 'A' && studentAnswers[count] != 'B' && studentAnswers[count] != 'C' && studentAnswers[count] != 'D')
	{
		cout << "You can only enter A, B, C, or D.\n";
		cout << "Enter the test takers answer to question #" << (count+1) << ":";
		cin >> studentAnswers[count];
	}
	}

	for (int count = 0; count < NUM_QUESTIONS; count++)
	{
		if (correctAnswers[count] == studentAnswers[count])
			correct++;
	}

	if (correct < 15)
	{
		cout << "You failed the exam. You need 15 correct questions to pass.\n";
		cout << "You only got " << correct << "questions correct.";
	}
	else
	{
		cout << "You passed! You got " << correct << "questions right!\n";
	}
	
}

[Lowest0ne]

Your TestGrader has two arrays of size 20. You make two sets of TestGraders in main, both being size 20. You have 400 ints in your program.

This project is a little strange, but such is life. If I'm to make an array of classes, I would have the class be:

class TestGrader
{
  private char score;
  
  void set(void)  { cin >> score; /* and what not */ }
  int get(void) { return score; }

  // Without an operator overload...
  bool correct(TestGrader& other)
  {
    return score == other.get();
  }
};

And in main:
TestGrader real[20], possible[20];