Illustrate Abstract Base Class
Write a C++ Program to illustrate Abstract Base Class. Here’s a Simple C++ Program to illustrate Abstract Base Class in C++ Programming Language.
What is Polymorphism in C++ ?
The word polymorphism means having many forms. Typically, polymorphism occurs when there is a hierarchy of classes and they are related 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.
Virtual Function : :
A virtual function is a function in a base class that is declared using the keyword virtual. Defining in a base class a virtual function, with another version in a derived class, signals to the compiler that we don’t want static linkage for this function.
Below is the source code for C++ Program to illustrate Abstract Base Class which is successfully compiled and run on Windows System to produce desired output as shown below :
SOURCE CODE : :
/* C++ Program to illustrate Abstract Base Class */ #include <iostream> using namespace std; class Polygon { protected: int width, height; public: void set_values (int a, int b) { width=a; height=b; } virtual int area (void) =0; }; class Rectangle: public Polygon { public: int area (void) { return (width * height); } }; class Triangle: public Polygon { public: int area (void) { return (width * height / 2); } }; int main () { Rectangle rect; Triangle trgl; Polygon * ppoly1 = ▭ Polygon * ppoly2 = &trgl; ppoly1->set_values (4,5); ppoly2->set_values (4,5); cout<<"\nExample to illustrate Abstract Base Class :: \n\n"; cout << ppoly1->area() << "\n"; cout << ppoly2->area() << "\n"; return 0; }
OUTPUT : :
/* C++ Program to illustrate Abstract Base Class */ Example to illustrate Abstract Base Class :: 20 10 Process returned 0
Above is the source code and output for C++ Program to illustrate Abstract Base Class which is successfully compiled and run on Windows System to produce desired output.
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