//------------------------------------------------------------------
//
// A program that illustrates some things about arrays
//
// Simon Parsons
// April 22nd 2007.
//
//------------------------------------------------------------------

//------------------------------------------------------------------
//
// Link the necessary libraries

#include <iostream>

using namespace std;

//------------------------------------------------------------------
//
// The main method

int main()
{

  // Initialisation

  int    age[8]       = {5, 10, 15, 20, 25};
  double number[5]    = {5.0, 10.1, 20.2, 30.3};
  char   sentence[30] = {'H', 'e', 'l', 'l', 'o', ' ', 'm', 'a', 't', 'e'};
  int    counter;
  int    sum          = 203;
  int    count        = 20;
  double average;

  // Show what initialisation does.

  cout << "Here are the arrays" << endl;

  for(counter = 0; counter < 8; counter++)
    {
      cout << age[counter] << "  ";
    }
  cout <<endl;

  for(counter = 0; counter < 5; counter++)
    {
      cout << number[counter] << "  ";
    }
  cout <<endl;

  for(counter = 0; counter < 30; counter++)
    {
      cout << sentence[counter];
    }
  cout <<endl << endl;

  // Cast doubles into integers and then print out the result

  cout << "What happens when we cast" << endl;
  
  for(counter = 0; counter < 4; counter++)
    {
      age[counter] = (int)number[counter];
    }

  for(counter = 0; counter < 8; counter++)
    {
      cout << age[counter] << "  ";
    }
  cout <<endl;

  // The other casring example from the slides

  average = sum/count;
  cout << average << endl;

  average = ((double)sum)/count;
  cout << average << endl << endl;

  // Mess with the values of an array:

  cout << "Modifying array elements" << endl;

  for(counter = 0; counter < 8; counter++)
    {
      age[counter]++;
      age[counter] = (age[counter] * 2)/3;
    }

  // Show the effect

  for(counter = 0; counter < 8; counter++)
    {
      cout << age[counter] << "  ";
    }
  cout <<endl << endl;

  // Playing with subscripts

  cout << "Playing with subscripts" << endl;

  cout << age[2+1] << endl;
  cout << age[counter - 2] << endl;
  cout << age[age[0]] << endl;

  return 0;
}