/*--------------------------------------------------
 File: avgGrade.cpp
 Name: Sharon M. Tuttle
 last modified: 5-3-05

 Contract: avgGrade : double[] int -> double
 Purpose: Compute the average of the first size
         grades in array grades.

 Examples: for double grades[10] = {76.5, 88.0, 99.6, 66, 
                                    43.0, 93.2, 73.0, 72.0, 
                                    74.0, 95};
          avgGrade(grades, 4) == 78.03
--------------------------------------------------*/

#include <iostream>
#include <cmath>
using namespace std;

double avgGrade(const double grades[], int size)
{
    double sumGrades = 0;

    // sum the grades in the array
    for (int i=0; i < size; i++)
    {
        sumGrades += grades[i];
    }

    // compute the average grade (if safe to do so...!)
    if (size != 0)
    {
        return sumGrades / size;
    }
    else
    {
        return 0;
    }
}