#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<cmath>
using namespace std;
class shape {
public:
	virtual void getarea() = 0;
	virtual void getperim() = 0;
};
class rectangle :public shape {
	int a, b, c;
	double s, p;
public:
	rectangle(int a1, int b1, int c1)
	{
		a = a1;
		b = b1;
		c = c1;
	}
	void getperim()
	{
		p = a + b + c;
		cout << "周长" << p << endl;
	}
	void getarea()
	{
		p = (a + b + c) / 2.0;
		s = sqrt(p*(p-a)*(p-b)*(p-c));
		cout << "面积" << s << endl;
	}
};
class circle :public shape {
	float r, s,p;
public:
	circle(float r1)
	{
		r = r1;
	}
	void getperim()
	{
		p = 2 * r*3.1415926;
		cout << "周长" << p << endl;
	}
	void getarea()
	{
		s = r*r*3.1415926;
		cout << "面积" << s << endl;
	}
};
void show(shape *p)
{
	p->getarea();
	p->getperim();
}
int main()
{
	shape *p;
	rectangle a(3, 4, 5);
	circle b(10);
	p = &a;
	show(p);
	p = &b;
	show(p);
	system("pause");
	return 0;
}