/////////////////////////////////////////////
// function.cpp - how do I use a function? //
/////////////////////////////////////////////
#include <iostream>
using namespace std;

// functions encapsulate some small piece of processing
// so that their callers don't have to worry about the
// details handled by the function

//----< print contents of integer array >----------------------

void printArray(int Arr[], int size) {

  cout << "\n  ";
  int i;
  for(i=0; i<size-1; i++)
    cout << Arr[i] << ", ";
  cout << Arr[size-1] << "\n\n";
}

//----< evaluate sum of elements of integer array >------------

int ArraySum(int *pInt, int size) {

  int i, sum = 0;
  for(i=0; i<size; i++)
    sum += pInt[i];
  return sum;
}
  
//----< build an array and display to standard output >--------

void main() {

  const int size = 5;
  int MainArray[size];
  int i;
  for(i=0; i<size; i++)
    MainArray[i] = -5 + 2*i;

  printArray(MainArray,size);
  
  cout << "  Sum of array elements is " 
       << ArraySum(MainArray,size)
       << "\n\n";
}