62_this_pointer.cpp

#include <iostream>
 
using namespace std;

class Shape {
   public:
      // Constructor definition
      Shape(int l = 2, int w = 2) 
      {
         length = l;
         width = w;
      }
		
      double Area() 
      {
         return length * width;
      }
		
	  //Use 'this' to compare areas
      int compareWithThis(Shape shape) 
      {
         return this->Area() > shape.Area();
      }

      //'this' is not necessary to compare shapes
      int compare(Shape shapeIn) 
      {
         return Area() > shapeIn.Area();
      }
      
   private:
      int length;     // Length of a box
      int width;
};

int main(void) 
{
   Shape sh1(4, 4);    // Declare shape1
   Shape sh2(2, 6);    // Declare shape2

   if(sh1.compare(sh2)) 
   {
      cout << "\nShape2 is smaller than Shape1" <<endl;
   } 
   else 
   {
      cout << "\nShape2 is equal to or larger than Shape1" <<endl;
   }

   if(sh1.compareWithThis(sh2)) {
      cout << "\nShape2 is smaller than Shape1" <<endl;
   } 
   else 
   {
      cout << "Shape2 is equal to or larger than Shape1" <<endl;
   }
   
   return 0;
}