cpp-coding-exercise/virtual-interface/main.cpp at main · DoctorLai/cpp-coding-exercise · GitHub

History

59 lines (49 loc) · 1.08 KB

Raw

/**

This example shows the interface using virtual functions in C++.

#include <iostream>

#include <memory>

class Shape

{

public:

virtual double

area() const = 0; // Pure virtual function

virtual ~Shape() {} // Virtual destructor

};

class Circle : public Shape

{

private:

double radius;

public:

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

double

area() const override

{

return 3.14159 * radius * radius;

}

};

class Rectangle : public Shape

{

private:

double width, height;

public:

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

double

area() const override

{

return width * height;

}

};

int

main()

{

std::unique_ptr<Shape> shapes[2];

shapes[0] = std::make_unique<Circle>(5.0);

shapes[1] = std::make_unique<Rectangle>(4.0, 6.0);

// The following line would cause a compilation error because Shape is an abstract class

// Shape a = new Shape();

for (int i = 0; i < 2; ++i) {

std::cout << "Area of shape " << i + 1 << ": " << shapes[i]->area() << std::endl;

}

return 0;

}

cpp-coding-exercise/virtual-interface/main.cpp at main · DoctorLai/cpp-coding-exercise · GitHub

Uh oh!

Expand file tree

Breadcrumbs

main.cpp

Latest commit

History

Breadcrumbs

main.cpp

File metadata and controls