Virtual functions retain virtual nature when inherited. : Inheritance « Class « C++

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Virtual functions retain virtual nature when inherited.
Virtual functions retain virtual nature when inherited.
  
#include <iostream>
using namespace std;

class BaseClass {
public:
  virtual void myFunction()
  {
    cout << "Using BaseClass version of myFunction()\n";
  }
};

class DerivedClass1 : public BaseClass {
public:
  void myFunction() 
  {
    cout << "Using DerivedClass1's version of myFunction()\n";
  }
};

class DerivedClass2 : public DerivedClass1 {
public:
  void myFunction() 
  {
    cout << "Using DerivedClass2's version of myFunction()\n";
  }
};

int main()
{
  BaseClass *p;
  BaseClass ob;
  DerivedClass1 derivedObject1;
  DerivedClass2 derivedObject2;

  p = &ob;
  p->myFunction();                   // use BaseClass's myFunction()

  p = &derivedObject1;
  p->myFunction();                   // use DerivedClass1's myFunction()

  p = &derivedObject2;
  p->myFunction();                   // use DerivedClass2's myFunction()

  return 0;
}


           
         
    
  
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4.Demonstrate inheriting a protected base class.Demonstrate inheriting a protected base class.
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6.Share member variables between sub classShare member variables between sub class
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9.Cascade constructor and destructor call
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