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; }
