Answer to Question #325929 in C++ for Prasoon Giri

Question

Create a class called Point which will have 2 co-ordinate value x & y and will be able to 

calculate the distance between two points. Write appropriate constructor and method of the class. 

Create another class called Shape, which takes different number of points to create a triangle, 

rectangle and circle. And also able to calculate the area and perimeter for the different shapes. 

Write the appropriate overloading method for this shape class. Write appropriate main function to 

test the shape class.

Answer 1

#include<iostream>
#include<cmath>

#define PI 3.14159


using namespace std;

class Point
{
	float x;
	float y;
public:
	Point(float _x, float _y):x(_x),y(_y){}
	Point(Point& p):x(p.x),y(p.y){}
	float Distance(Point& p)
	{
		return sqrt(pow((p.x - x), 2) + pow((p.y - y), 2));
	}
};


class Shape
{
public:
	virtual float Area() = 0;
	virtual float Perimetr() = 0;
};


class Triangle:public Shape
{
	Point a;
	Point b;
	Point c;
public:
	Triangle(Point _a, Point _b, Point _c):a(_a),b(_b),c(_c){}
	float Area()
	{
		float p = Perimetr()/2;
		return sqrt(p*(p - a.Distance(b))*(p - b.Distance(c))*(p - c.Distance(a)));
	}
	float Perimetr()
	{
		return a.Distance(b) + b.Distance(c) + c.Distance(a);
	}
};


class Circle :public Shape
{
	Point a;
	Point b;
public:
	Circle(Point _a, Point _b):a(_a),b(_b){}
	float Area()
	{
		return PI*pow(a.Distance(b), 2);
	}
	float Perimetr()
	{
		return 2 * PI*a.Distance(b);
	}
};


class Rectangl :public Shape
{
	Point a;
	Point b;
	Point c;
	Point d;
public:
	Rectangl(Point _a, Point _b, Point _c,Point _d) : a(_a), b(_b), c(_c),d(_d) {}
	float Area()
	{
		return a.Distance(b)*b.Distance(c);
	}
	float Perimetr()
	{
		return a.Distance(b) + b.Distance(c) + c.Distance(d) + d.Distance(a);
	}
};
int main()
{
	Point a(1, 2);
	Point b(1, 5);
	cout << "Distance a b = "<<a.Distance(b)<<endl;
	Point c(8, 5);
	Point d(8, 2);
	Triangle t(a, b, c);
	Circle cir(a, c);
	Rectangl r(a, b, c, d);
	Shape* sh = &t;
	cout << "Triangle`s perimetr is " << t.Perimetr()<<endl;
	cout << "Triangle`s area is " << t.Area() << endl;
	sh = &cir;
	cout << "Circle`s perimetr is " << cir.Perimetr() << endl;
	cout << "Circle`s area is " << cir.Area() << endl;
	sh = &r;
	cout << "Rectangle`s perimetr is " << r.Perimetr() << endl;
	cout << "Rectangle`s area is " << r.Area() << endl;
}