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Demo Program - Arrays and Functions

Task:  This assignment will be an "upgrade" of the previous demo with the use of functions.  Create a function to fill an array with 25 grades.  Create a function to print the array.  Create a function to find the average of the grades and return the average to main.
 
#include <iostream.h>
#include <stdlib.h>
#include <apvector.h>

void fill_it(apvector <int>&grades);
void print_it(apvector <int>&grades);
double average(apvector <int>&grades);

int main(void)
{
     system ("CLS");
     apvector <int> grades(25);

     //Call function to Fill array
     fill_it(grades);

     //Call function to Print the array
     print_it(grades);

     //Call function to average the grades
     double avg = average(grades);

     cout<<"The average of the grades: " << avg;
     cout<<endl<<endl;
     return 0;
}
//Function to fill array
void fill_it(apvector <int>&grades)
{
     int size = grades.length();
     for (int i = 0; i < size; i++)
     {
          cout<<"Please enter grade: ";
          cin>> grades[i];
     }
     return;
}
//Function to print array
void print_it(apvector <int>&grades)
{
     int len = grades.length( );
     for(int i = 0; i < len; i++)
     {
          cout<<grades[i] << endl;
     }
     return;
}
//Function to average the grades
double average(apvector <int>&grades)
{
      int total = 0;
      double avg;
      int len = grades.length( );
     for(int i = 0; i < len; i++)
    {
          total += grades[i];
     }
     avg = (double) total/len; //avoid integer division
     return avg;
}