//
// demonstrates a basic array class
//
// Written by Maxwell Sayles, 2001, for CPSC331, University of Calgary.
//

#include <stdlib.h>
#include <time.h>

#include <iostream>
using namespace std;

//
// simple array class that handles integers
//
class Array
{
public:
	Array (int low, int high); // indexes low through high inclusive
	~Array();

	int getLow()			{ return this->low; }
	int getHigh()			{ return this->high; }
	
	int getElementCount()	{ return this->high - this->low + 1; }

	int getElement (int index);
	void setElement (int index, int value);
	
	// provide operator overloading, more complicated syntactically
	int& operator[] (int index);
	
private:
	int* data;
	int low;
	int high;
};

//
// creation
//
Array::Array (int low, int high)
{
	this->low = low;
	this->high = high;
	this->data = new int[high-low+1];
}

//
// destruction
//
Array::~Array()
{
	delete[] this->data;
}

//
// retrieve an element at the specified index
//
int Array::getElement (int index)
{
	return this->data[index - this->low];
}


//
// set the elements at the specified index
//
void Array::setElement (int index, int value)
{
	this->data[index - this->low] = value;
}


//
// C-Style array indexing
//
int& Array::operator[] (int index)
{
	return this->data[index - this->low];
}


//
// program entry
//
int main()
{
	int i = 0;

	// seed the random number generator
	srand((unsigned int)time(0));

	// ask user for upper and lower bounds of the array
	int low = 0;
	int high = 0;
	cout << "Enter array low bound (e.g. 0) : " << flush;
	cin >> low;
	cout << "Enter array upper bound (e.g. 100) : " << flush;
	cin >> high;
	cout << endl;

	// construct the array
	Array a(low, high);
	

	// this portion demonstrates the getter and setter methods
	cout << "Testing getter/setter methods..." << endl;

	// store elements into array
	for (i = a.getLow();  i <= a.getHigh();  i ++)
	{
		a.setElement (i, rand() % a.getElementCount());
	}
	
	// get elements out of array
	for (i = a.getLow();  i <= a.getHigh();  i ++)
	{
		cout << a.getElement (i) << ' ';
	}
	cout << endl << endl;
	

	// this portion demonstrates C-Style array indexing
	cout << "Testing operator overloading..." << endl;
	
	// use operator overloading, store elements into array
	for (i = a.getLow();  i <= a.getHigh();  i ++)
	{
		a[i] = rand() % a.getElementCount();
	}
	
	// use operator overloading, get elements out of array
	for (i = a.getLow();  i <= a.getHigh();  i ++)
	{
		cout << a[i] << ' ';
	}
	cout << endl;
}