fucked up grade average thing.

//Christian Ballard
//COSC 1330 - 003
//This program should calculate students weighted averages.
#include <iostream>
#include <iomanip>
using namespace std;

double averageGrade(double &);
double classAverage(double);
char getLetterGrade(char);
void displayGradeReport();



int main()
{
    double labAverage = 0.0;
    double testAverage = 0.0;
    double projectAverage = 0.0;
    double overallAverage = 0.0;
    char letterGrade = ' ';


    cout << "Please enter your lab grades." << endl << "(Enter a negative number when you are finished entering grades.)" << endl;
    averageGrade(labAverage);

    cout << labAverage << endl;



    system("pause");
    return 0;
}

double averageGrade(double &gradeAverage)
{
    double grades = 0.0;
    int numGrades = 0;
    double sum = 0.0;

        while (grades >= 0)
        {
            cin >> grades;
            numGrades++;
            sum = grades + sum;
            gradeAverage = sum / numGrades;
        }
    return gradeAverage;
}

double classAverage(double)
{
    double const LABWEIGHT = .5;
    double const TESTWEIGHT = .4;
    double const PROJECTWEIGHT = .1;


    return 0;
}

char getLetterGrade(char)
{

    return 0;
}

void displayGradeReport()
{

}