CPP

operator overloading

// C++ program to demonstrate 
// Operator Overloading or
// Compile-Time Polymorphism
#include <iostream>
using namespace std;
  
class Complex {
private:
    int real, imag;
  
public:
    Complex(int r = 0, 
            int i = 0)
    {
        real = r;
        imag = i;
    }
  
    // This is automatically called 
    // when '+' is used with between 
    // two Complex objects
    Complex operator+(Complex const& obj)
    {
        Complex res;
        res.real = real + obj.real;
        res.imag = imag + obj.imag;
        return res;
    }
    void print() 
    { 
      cout << real << " + i" << 
              imag << endl; 
    }
};
  
// Driver code
int main()
{
    Complex c1(10, 5), c2(2, 4);
    
    // An example call to "operator+"
    Complex c3 = c1 + c2; 
    c3.print();
}

operator overloading

std::ostream& operator<<(std::ostream& out, const Course& course)
{
    out << course.getName(); // for example
    return out;
}

operator overload

#include <iostream>
using namespace std;

class Box {
   public:
      double getVolume(void) {
         return length * breadth * height;
      }
      void setLength( double len ) {
         length = len;
      }
      void setBreadth( double bre ) {
         breadth = bre;
      }
      void setHeight( double hei ) {
         height = hei;
      }
      
      // Overload + operator to add two Box objects.
      Box operator+(const Box& b) {
         Box box;
         box.length = this->length + b.length;
         box.breadth = this->breadth + b.breadth;
         box.height = this->height + b.height;
         return box;
      }
      
   private:
      double length;      // Length of a box
      double breadth;     // Breadth of a box
      double height;      // Height of a box
};

// Main function for the program
int main() {
   Box Box1;                // Declare Box1 of type Box
   Box Box2;                // Declare Box2 of type Box
   Box Box3;                // Declare Box3 of type Box
   double volume = 0.0;     // Store the volume of a box here
 
   // box 1 specification
   Box1.setLength(6.0); 
   Box1.setBreadth(7.0); 
   Box1.setHeight(5.0);
 
   // box 2 specification
   Box2.setLength(12.0); 
   Box2.setBreadth(13.0); 
   Box2.setHeight(10.0);
 
   // volume of box 1
   volume = Box1.getVolume();
   cout << "Volume of Box1 : " << volume <<endl;
 
   // volume of box 2
   volume = Box2.getVolume();
   cout << "Volume of Box2 : " << volume <<endl;

   // Add two object as follows:
   Box3 = Box1 + Box2;
   

   // volume of box 3
   volume = Box3.getVolume();
   cout << "Volume of Box3 : " << volume <<endl;

   return 0;
}