Initial commit

c++/Others/Abstract classes by virtual function with no body.cpp

@@ -0,0 +1,42 @@
+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;
+}