#include "intarray.h"

//****************************************************
// Constructor for IntArray class. Sets the size of  *
// the array and allocates memory for it.            *
//****************************************************
IntArray::IntArray(int s)
{
	arraySize = s;
	aptr = new int [s];
	for (int count = 0; count < arraySize; count++)
		*(aptr + count) = 0;
}

//****************************************************
// Copy constructor for IntArray class.              *
//****************************************************
IntArray::IntArray(const IntArray &obj)
{
	arraySize = obj.arraySize;
	aptr = new int [arraySize];
	for(int count = 0; count < arraySize; count++)
		*(aptr + count) = *(obj.aptr + count);
}

//****************************************************
// Destructor for IntArray class.                    *
//****************************************************
IntArray::~IntArray()
{
	if (arraySize > 0)
		delete [] aptr;
}

//*****************************************************
// subError function. Displays an error message and   *
// exits the program when a subscript is out of range.*
//*****************************************************
void IntArray::subError()
{
	cout << "ERROR: Subscript out of range.\n";
	exit(0);
}

//******************************************************
// Overloaded [] operator. The argument is a subscript *
// This function returns a reference to the element    *
// in the array indexed by the subscript.              *
//******************************************************
int &IntArray::operator[](int sub)
{
	if (sub < 0 || sub >= arraySize)
		subError();
	return aptr[sub];
}