Virtual functions are hierarchical. : Virtual « Function « C++

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Virtual functions are hierarchical.


#include <iostream>
using namespace std;

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

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

class DerivedClass2 : public BaseClass {
public:
  DerivedClass2(int x: BaseClass(x) {}
};

int main()
{
  BaseClass *p;
  BaseClass ob(10);  
  DerivedClass1 derivedObject1(10);   
  DerivedClass2 derivedObject2(10)
  p = &ob;
  p->myFunction();                       // use BaseClass's myFunction()

  p = &derivedObject1;
  p->myFunction();                       // use DerivedClass1's myFunction()
  p = &derivedObject2;
  p->myFunction();                       // use BaseClass's myFunction()

  return 0;
}


           
       
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5.Virtual function and public inheritanceVirtual function and public inheritance
6.Virtual function and three level inheritanceVirtual function and three level inheritance
7.Virtual function for two derived classesVirtual function for two derived classes
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