class c++

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• data encapsulation
• providing a convenient way of modeling real-world objects
• simplifying code reuse

• class Box {
     public:
        double length;   // Length of a box
        double breadth;  // Breadth of a box
        double height;   // Height of a box
  };

• 
  Following statements declare two objects of class Box:
  Box Box1;          // Declare Box1 of type Box
  Box Box2;          // Declare Box2 of type Box
  
  
  Both of the objects Box1 and Box2 will have their own copy of data members.
  

• #include <iostream>
  
  using namespace std;
  
  class Box {
     public:
        double length;   // Length of a box
        double breadth;  // Breadth of a box
        double height;   // Height of a box
  };
  
  int main( ) {
     Box Box1;        // OBJECT Declare Box1 of type Box
     Box Box2;        // OBJECT Declare Box2 of type Box
     double volume = 0.0;     // Store the volume of a box here
   
     // box 1 specification
     Box1.height = 5.0; 
     Box1.length = 6.0; 
     Box1.breadth = 7.0;
  
     // box 2 specification
     Box2.height = 10.0;
     Box2.length = 12.0;
     Box2.breadth = 13.0;
   
     // volume of box 1
     volume = Box1.height * Box1.length * Box1.breadth;
     cout << "Volume of Box1 : " << volume <<endl;
  
     // volume of box 2
     volume = Box2.height * Box2.length * Box2.breadth;
     cout << "Volume of Box2 : " << volume <<endl;
   
     return 0;
  }

• Result

• Volume of Box1 : 210
  Volume of Box2 : 1560
  

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