Shapes Using OOP in C++

 In this article I will share to you how to write a C++ program to demonstrate object-oriented programming using C++.

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Program Listing

#include <iostream>
#include <cmath>
#include <iomanip>


class Shape {
public:
    virtual double calculateArea() = 0; // Pure virtual function, making the class abstract
};

class Rectangle : public Shape {
private:
    double width;
    double height;

public:
    Rectangle(double w, double h) : width(w), height(h) {}

    double calculateArea() override {
        return width * height;
    }
};

class Circle : public Shape {
private:
    double radius;

public:
    Circle(double r) : radius(r) {}

    double calculateArea() override {
        return M_PI * radius * radius;
    }
};

class Triangle : public Shape {
private:
    double base;
    double height;

public:
    Triangle(double b, double h) : base(b), height(h) {}

    double calculateArea() override {
        return 0.5 * base * height;
    }
};

int main() {
    Rectangle rect(8.0, 2.0);
    Circle circle(4.2);
    Triangle triangle(4.0, 7.0);

    Shape* shapes[] = {&rect, &circle, &triangle};

    std::cout << "\n\tShapes Using OOP in C++\n\n";

    for (Shape* shape : shapes) {
        std::cout << "\tArea: " <<std::fixed <<std::setprecision(2) << shape->calculateArea() << std::endl;
    }
    std::cout << "\n\tEnd of Program\n";
    return 0;
}