Detailed Description:Sample Output
Area of rectangle 1 is 6400
Area of rectangle 2 is 5600
The number of rectangles is 2
After using copy constructor, total number of rectangles is 3
The number of rectangles is 2
1. The class should have 4 members: iTop, iRight, iBot, and iLeft, all of type int.
2. Area of both rectangles should be calculated by using iTop, iRight, iBot, and iLeft.
3. It should have a default constructor and a copy constructor.
4. It should have a destructor.
5. It should contain all required getters and setters.
6. It should contain a static member, iRefCount, which keeps track of the number of CRectangle objects. Increment it in the constructor, and decrement it in the destructor.
Hint:
CRectangle would implement rectangles by using left, right, top and bottom and calculate their areas to compare.
Answer
using namespace std;
#include <iostream>
#include <conio.h>
class CRectangle {
private:
int iLeft; // Class members
int iTop;
int iRight;
int iBottom;
static int iRefCount; // Static variables
public:
CRectangle::CRectangle (int l = 0, int t = 0, int r = 1, int b = 1); // Constructors
CRectangle::CRectangle (CRectangle& rect);
CRectangle::~CRectangle ();
int GetLeft() // Getters
{
return iLeft;
}
int GetTop()
{
return iTop;
}
int GetRight()
{
return iRight;
}
int GetBottom()
{
return iBottom;
}
void SetLeft(int iValue) // Setters
{
iLeft = iValue;
}
void SetTop(int iValue)
{
iTop = iValue;
}
void SetRight(int iValue)
{
iRight = iValue;
}
void SetBottom(int iValue)
{
iBottom = iValue;
}
int Area()
{
return((iRight - iLeft) * (iBottom - iTop));
}
static int GetRefCount()
{
return iRefCount;
}
};
int CRectangle::iRefCount = 0; // Static variables
CRectangle::CRectangle (int l ,int t , int r , int b) // Default constructor
{
iLeft = l;
iTop = t;
iRight = r;
iBottom = b;
iRefCount++;
}
CRectangle::CRectangle (CRectangle& rect) // Copy constructor.
{
iLeft = rect.iLeft;
iTop = rect.iTop;
iRight = rect.iRight;
iBottom = rect.iBottom;
iRefCount++;
}
CRectangle::~CRectangle ()
{
iRefCount--;
}
int main()
{
CRectangle rect1(80, 120, 160, 200);
CRectangle rect2(100, 140, 180, 210);
int iArea = rect1.Area(); // Calc area and output.
cout << "Area of rectangle 1 is " << iArea << endl;
iArea = rect2.Area();
cout << "Area of rectangle 2 is " << iArea << endl;
cout << "The number of rectangles is " << rect1.GetRefCount() << endl; // Output total number of rectangles.
CRectangle* pRectangle = new CRectangle(); // Dynamically create a new instance of CRectangle.
cout << "After using Copy constructor, total number of rectangles is " << rect1.GetRefCount() << endl; // Output total number of rectangles.
delete pRectangle; // Delete the rectangle object.
cout << "The number of rectangles is " << rect1.GetRefCount() << endl; // Output total number of rectangles.
pRectangle = NULL;
getch();
return 0;
}
