// ******************************************************************
//
//  Grades.cpp
//
//  This program computes student grades. For each student, two
//  quiz grades (graded on a 10 point basis), one midterm exam grade
//  and one final exam grade (each on a 100 point basis) are read
//  in. The final numeric grade is computed weighing the final
//  exam 50%, the midterm 25%, and the quizzes 25%. The numeric
//  grade and corresponding letter grade are output.
//
// ******************************************************************

#include <iostream>

using namespace std;

//
// Structure for a student record
//
struct StudentRecord
{
	int quiz1, quiz2, midtermExam, finalExam;
	double courseAverage;
	char letterGrade;
};

// function declaration a.k.a function prototype
void inputRecord (StudentRecord& recordFormalParameter);
void outputRecord (StudentRecord recordFormalParameter);
void computeAverage (StudentRecord& recordFormalParameter);
char letterGrade (double numericGradeFormalParameter);

int main () {

	StudentRecord pupilRecord;
	inputRecord (pupilRecord);
	computeAverage (pupilRecord);
	outputRecord (pupilRecord);
	return 0;
}

void inputRecord (StudentRecord& record)
{
	cout << "\nEnter first quiz score: ";
	cin >> record.quiz1;
	cout << "\nEnter second quiz score: ";
	cin >> record.quiz2;
	cout << "\nEnter mid-term exam score: ";
	cin >> record.midtermExam;
	cout << "\nEnter final exam score: ";
	cin >> record.finalExam;
	cout << endl;
}
	// --------------------------------
	// --------- END USER CODE --------
	// --------------------------------


void outputRecord (StudentRecord record)
{
    cout << endl;
    cout << "Quiz Scores: " << record.quiz1 << "  " << record.quiz2 << endl;
    cout << "Midterm Exam Score: " << record.midtermExam << endl;
    cout << "Final Exam Score: " << record.finalExam << endl;
    cout << endl;
    cout << "Course Average: " << record.courseAverage << endl;
    cout << "Final Letter Grade: " << record.letterGrade << endl;
    cout << endl;
}


void computeAverage (StudentRecord& record)
{
    const double EXAM_WT = 0.5;
    const double MIDTERM_WT = 0.25;
    const double QUIZ_WT = 0.25;
    double quiz1Percent, quiz2Percent;

    //
    // Convert the 10 point quizzes to a percent, then find the average
    //
    quiz1Percent = 100 * record.quiz1 / 10.0;
    quiz2Percent = 100 * record.quiz2 / 10.0;
    double quizAvg = (quiz1Percent + quiz2Percent) / 2;

    //
    // Compute the weighted average to get the numeric course grade
    //
    record.courseAverage = quizAvg * QUIZ_WT +
        record.midtermExam * MIDTERM_WT + record.finalExam * EXAM_WT;

    //
    // Call the letterGrade function to find the corresponding letter grade
    record.letterGrade = letterGrade (record.courseAverage);

}



char letterGrade (double numericGrade)
{
    char letter;

    if (numericGrade < 60)
        letter = 'F';
    else if (numericGrade < 70)
        letter = 'D';
    else if (numericGrade < 80)
        letter = 'C';
    else if (numericGrade < 90)
        letter = 'B';
    else
        letter = 'A';

    return letter;
}

/*
 * Example 1:
 *
Enter first quiz score: 10

Enter second quiz score: 10

Enter mid-term exam score: 100

Enter final exam score: 100


Quiz Scores: 10  10
Midterm Exam Score: 100
Final Exam Score: 100

Course Average: 100
Final Letter Grade: A

Press any key to continue . . .

 *
 * Example 2:
 *
Enter first quiz score: 6

Enter second quiz score: 7

Enter mid-term exam score: 40

Enter final exam score: 70


Quiz Scores: 6  7
Midterm Exam Score: 40
Final Exam Score: 70

Course Average: 61.25
Final Letter Grade: D

Press any key to continue . . .
*/