等边形状周长面积计算

通过输入边长以及等边多边形的边长计算出等边三角形、等边多边形、正方形的周长和面积。
代码如下：
Calculate.h

#pragma once
#include<iostream>
using namespace std;
class Calculate
{
public:
	Calculate(double , int) ; 
	void Calculates();
	virtual void area() = 0;
protected:
	double Clong;int Cnum;
};
#pragma region 多边形
class Polygon :public Calculate
{
public:
	Polygon(double,int);
	void area(void);
};
#pragma endregion
#pragma region 正方形
class Square :public Calculate
{
public:
	Square(double);
	void area(void);
};
#pragma endregion
#pragma region 三角形
class Triangle :public Calculate
{
public:
	Triangle(double);
	void area(void);
};
#pragma endregion

Main.cpp

#include "Calculate.h"
void main(){
	Calculate* CLL ;
	
	cout << "请输入三角形正方形多边形的边长，以及多边形的边长数量";
	double x;
	int y;
	cin >> x >> y;
	Polygon P(x,y);//等边多边形
	CLL = &P;
	CLL->area();
	Square S(x);//正方形
	CLL = &S;
	CLL->area();
	Triangle T(x);//等边三角形
	CLL = &T;
	CLL->area();
}

Calculate.cpp

#include"Calculate.h"
#include<math.h>
Calculate::Calculate(double longing = 0, int numing = 0) {
	Clong = longing;
	Cnum = numing;
}
Polygon::Polygon(double d, int i) :Calculate(d, i) {
	this->Clong = d;
	this->Cnum = i;
}
void Polygon::area(void) {
	cout << "多边形周长为" << Cnum * Clong << endl;
	const double PI = 3.1415926;
	//（边数*边长*边长）/（4*tan(π/边数)）
	cout<< "多边形面积为" << (Cnum * Clong*Clong)/(4*tan(PI/ Cnum)) << endl;
};
Square::Square(double d) :Calculate(d) {
	this->Clong = d;
}
void Square::area(void) {
	cout << "正方形周长为" << 4 * Clong << endl;
	cout << "正方形面积为" << Clong * Clong << endl;
};
Triangle::Triangle(double d) :Calculate(d) {
	this->Clong = d;
}
void Triangle::area(void) {
	cout << "三角形周长为" << 3 * Clong << endl;
	//等边三角形的面积计算公式可以取0.433倍边长的平方
	cout << "三角形面积为" << 0.433 * Clong * Clong << endl;
};

效果如下：