What is the c plus plus program to find the area and perimeter of a circle and rectangle?

Answer 1

#include<iostream>

struct shape

{

virtual double perimeter() const = 0;

virtual double area() const = 0;

};

struct circle : shape

{

circle (double radius): r(radius), pi(4*atan(1)) {}

double perimeter() const { return 2*pi*r; }

double area() const { return pi*r*r; }

private:

double r;

const double pi;

};

struct rectangle : shape

{

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

double perimeter() const { return 2*(w+h); }

double area() const { return w*h; }

private:

double w;

double h;

};

int main()

{

using std::cout;

using std::endl;

circle c (3.0);

cout << "Circle with radius 3.0\n";

cout << "\tPerimiter: " << c.perimiter() << '\n';

cout << "\tArea: " << c.area() << '\n';

cout << endl;

rectangle r (4.0, 5.0);

cout << "Rectangle with width 4.0 and height 5.0\n";

cout << "\tPerimiter: " << r.perimiter() << '\n';

cout << "\tArea: " << r.area() << '\n';

cout << endl;

}