C++ Polymorphism C-PLUS-PLUS
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C++ Polymorphism
C++ Polymorphism
Polymorphism means having many forms. Typically, polymorphism occurs when there is a hierarchy of classes and they are related by inheritance.
Polymorphism means "many forms", and it occurs when we have many classes that are related to each other by inheritance.
C++ polymorphism means that a call to a member function will cause a different function to be executed depending on the type of object that invokes the function.
Example
#include <iostream>
#include <string>
using namespace std;// Base class
class Animal {
public:
void animalSound() {
cout << "The animal makes a sound \n" ;
}
};// Derived class
class Pig : public Animal {
public:
void animalSound() {
cout << "The pig says: wee wee \n" ;
}
};// Derived class
class Dog : public Animal {
public:
void animalSound() {
cout << "The dog says: bow wow \n" ;
}
};int main() {
Animal myAnimal;
Pig myPig;
Dog myDog;myAnimal.animalSound();
myPig.animalSound();
myDog.animalSound();
return 0;
}
Output:
The animal makes a sound
The pig says: wee wee
The dog says: bow wow
Why And When To Use "Inheritance" and "Polymorphism"?
It is useful for code reusability: reuse attributes and methods of an existing class when you create a new class.
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