Abstract class in CPP
Abstract Class is a Class that can not be Instantiated. In programming languages, an Abstract class in CPP is a generic class (or type of object) that can not be instantiated directly. It’s used as a basis for creating hierarchies of classes and specific objects that conform its protocol.
Use of abstract class in c++
#include <iostream>
using namespace std;
// Base class
class Shape
{
public:
// pure virtual function providing interface framework.
virtual int getArea() = 0;
void setWidth(int w)
{
width = w;
}
void setHeight(int h)
{
height = h;
}
protected:
int width;
int height;
};
// Derived classes
class Rectangle: public Shape
{
public:
int getArea()
{
return (width * height);
}
};
class Triangle: public Shape
{
public:
int getArea()
{
return (width * height)/2;
}
};
int main(void)
{
Rectangle Rect;
Triangle Tri;
Rect.setWidth(5);
Rect.setHeight(7);
// Print the area of the object.
cout << “Total Rectangle area: ” << Rect.getArea() << endl;
Tri.setWidth(5);
Tri.setHeight(7);
// Print the area of the object.
cout << “Total Triangle area: ” << Tri.getArea() << endl;
return 0;
}
Pure virtual function in c++
Example of abstract class in C++
C program to draw a square using graphics (click here)
Abstract program in CPP
Note:- Maybe sometime above code doesn’t get user-friendly output, in code block ‘or’ any other EDITOR, All of C & C++ program tested in DOS compiler Turbo C.
Also, Read
Types of functions in C Read Here
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