// Andres Guzman CSC5 Chapter 7, P. 446, #9
 /******************************************************************************
 *                                                                        
 *  COMPARE STUDENT ANSWERS                                                         
 *  ____________________________________________________________________________  
 *  This program will determine whether a students answers match the correct 
 *  answer sheet.
 *  ____________________________________________________________________________  
 *                                                                        
 *  INPUT                                                                 
 *                                                                        
 * [SIZE] = array size
 * coranswers[SIZE] = correct answers list
 * studanswers[SIZE] = student answers                                                                  
 *  OUTPUT                                                                
 *                                                                        
 *  correct = subscripts that match correct list
 *  incorrect = subscripts that dont match correct list
 *                                                                        
 ******************************************************************************/
#include <iostream>
using namespace std;
 
int main() 
{
const int SIZE = 20;	//Array Size
int i;	//counter to cycle subscripts
//Initialization list of correct answers
char coranswers[SIZE] = {'B', 'D', 'A', 'A', 'C', 'A', 'B', 'A', 'C', 'D', 'B',
						 'C', 'D', 'A', 'D', 'C', 'C',  'B', 'D', 'A'};
char studanswers[SIZE];	//Subscripts for characters
int correct = 0;	//Accumulator for correct answers
int incorrect = 0;	//Accumulator for incorrect answers
//
//Initializing For Loop
for(i = 0; i < SIZE; i++)
	{
		cout << "Question " << (i + 1) << " Student Answer: ";
		cin >> studanswers[i];
		while(studanswers[i] != 'A' && studanswers[i] != 'B' &&
			  studanswers[i] != 'C' && studanswers[i] != 'D') //Input Validation
			{
				cout << "Invalid Letter Grade." << endl;
				cout << "Question " << (i + 1) << " Student Answer: ";
				cin >> studanswers[i];
			}
		if(studanswers[i] == coranswers[i])	//Determines if answers match
			{
				correct++;	//Increases amount of correct answers
			}
		else
			{
				incorrect++;	//Increases amount of incorrect answers
			}
	 cout << endl;
	}
	if(correct >= 15)	//Determines if there are 15 or more correct answers
	{
		cout << "\nPASS!\n" << "Correct Questions: " << correct << endl;
		cout << "Incorrect Questions: " << incorrect;
	}
	else				//When there are less than 15 correct answers
	{	
		cout << "\nFail\n" << "Correct Questions: " << correct << endl;
		cout << "Incorrect Questions: " << incorrect;
	}
 
	cout << "\n\nIncorrect Questions" << endl;
//
//Initializing For Loop for display all the incorrect answers
	for(i = 0; i < SIZE; i++)
	{
		if(studanswers[i] != coranswers[i])	//When the answers do not match
			cout << "Question " << (i + 1) << endl;
	}
	return 0;
}

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