Abstract classes by virtual function with no body : virtual function « Class « C++

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C++ » Class » virtual functionScreenshots 
Abstract classes by virtual function with no body
  
#include <iostream>
using namespace std;

class Animal{
public:
    Animal(int health = 100);
    virtual void Greet() const 0;   //pure virtual member function
    virtual void DisplayHealth() const;

protected:
    int m_Health;
};

Animal::Animal(int health): m_Health(health){}
void Animal::DisplayHealth() const{
    cout << "Health: " << m_Health << endl;
}

class Orc : public Animal{
public:
    Orc(int health = 120);
    virtual void Greet() const;
};

Orc::Orc(int health):
    Animal(health)
{}

void Orc::Greet() const
{
    cout << "The orc grunts hello.\n";
}

int main()
{
    Animal* pAnimal = new Orc();
    pAnimal->Greet();
    pAnimal->DisplayHealth();

    return 0;
}
  
    
  
Related examples in the same category
1.virtual function from base and derived classes
2.Virtual function and two subclasses
3.Override non-virtual function
4.Implementing Pure Virtual Functions
5.Illustration of the Use of Virtual Inheritance
6.Using Virtual Methods
7.Multiple Virtual Functions Called in Turn
8.Virtual Copy Constructor
9.virtual functions accessed from pointer
10.virtual functions with person class
11.Call parent virtual function
12.Using Virtual Functions to control the behaviour
13.Pure Virtual Functions as a prototype
14.Virtual Functions Are Hierarchical
15.Virtual function in three level inheritance
16.The Virtual Attribute Is Inherited
17.Virtual Functions and Polymorphism
18.A base class reference is used to access a virtual function
19.Virtual base classes.
20.virtual members
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