Inheritance

class Human{
public:
  int height;
  int weight;
  int age;

public:
  int getAge(){
    return this->age
  }

  int getHeight(){
    return this->height
  }
};

class Gay{
public:
  void speak(){
    cout<<"I'm gay"
  }
};

class Male:public Human, public Gay{
  public:
  string color;

  void sleep(){
    cout<<"Male sleeping"<<"\n";
  }
}

• private data members of any class cannot be inherited

Types of Inheritance

• Single inheritance
• Multiple inheritance
• Multi-level inheritance
• hierarchial inheritance
• Hybrid inheritance

Inheritance Ambiguity

• '::' : scope resolution operator

Diamond Problem

  A
 / \
B   C
 \ /
  D

class A{};
class B : virtual public A{};
class C : virtual public A{};

class D : public B, public C {};

• pure virtual function :

virtual void calculateInterest() = 0;

A pure virtual function should be overriden by derived class

• Abstract class : A class that is intended to be used for inheritance. It cannot be instantiated. An abstract class can consist of both abstract and non-abstract methods.