Pure virtual function - Definition - Polymorphism and Abstract Classes

Discussion

• Brijesh   -Posted on 05 Oct 15
  A virtual function that has no definition within the base class is called as pure virtual function. If there is a condition that derived class must override the particular function or complete definition of a function is not defined in the base class then we will declare function as a virtual function in the base class.
  Syntax for declaring a pure virtual function is as follows:
  virtual ret_type fun_name(parameter_list)=0;
  Example:
  class baseClass
  {
  public:
  virtual void show()=0; //------? Pure virtual function.
  };
  class deriveClass: public baseClass
  {
  public:
  void show()
  {
  cout<<"Welcome at careeride.com";
  }
  };
  int main() {
  
  deriveClass obj;
  obj.show();
  
  return 0;
  }
  

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