In this tutorial, I will explain about the Polymorphism concept in cplusplus. Polymorphism is the advanced concept of OOP (Object Oriented Programming).
The word Polymorphism stand for having many forms. Typically, Polymorphism used in case of inheritance within a class or different class.
Below program will explain the concept of Polymorphism and at the end of this tutorial, we have shared the output of the below c++ program.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | #include <iostream> using namespace std; class Shape { protected: int width, height; public: Shape( int a = 0, int b = 0){ width = a; height = b; } int area() { cout << "Parent class area :" <<endl; return 0; } }; class Rectangle: public Shape { public: Rectangle( int a = 0, int b = 0):Shape(a, b) { } int area () { cout << "Rectangle class area :" <<endl; return (width * height); } }; class Triangle: public Shape { public: Triangle( int a = 0, int b = 0):Shape(a, b) { } int area () { cout << "Triangle class area :" <<endl; return (width * height / 2); } }; int main() { Shape *shape; Rectangle rec(10,7); Triangle tri(10,5); shape = &rec; shape->area(); shape = &tri; shape->area(); return 0; } |
Parent class area :
Parent class area :
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Did you notice that the output shows that the same method is called twice?
So polymorphism means a lot of different code that results in the same behaviour??? I thought not.