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#include "stdafx.h"
// ConsoleApplication1.cpp : 定义控制台应用程序的入口点。
//
#include < iostream>
#include <tchar.h>
#define M_PI 3. 14159265358979323846
using namespace std;
class CFigure
{
public:
virtual char* FigureType() = 0;
virtual double Circumference() = 0;
virtual double Area() = 0;
virtual ~ CFigure(){ }
};
class CTriangle : public CFigure
{
public:
CTriangle()
{
a = b = c = 0;
}
CTriangle(double a, double b, double c) : a(a), b(b), c(c) { }
char* FigureType()
{
return "Triangle";
}
double Circumference()
{
return a + b + c;
}
double Area()
{
double S = Circumference() / 2;
return sqrt(S * (S - a) * (S - b) * (S - c));
}
private:
double a, b, c;
};
class CSquare : public CFigure
{
public:
CSquare()
{
a = 0.0;
b = 0.0;
}
CSquare(double a, double b) : a(a), b(b)
{
}
char* FigureType()
{
return "Square";
}
double Circumference()
{
return 2 * a + 2 * b;
}
double Area()
{
return a * b;
}
private:
double a, b;
};
class CCircle : public CFigure
{
public:
CCircle()
{
r = 0;
}
CCircle( double r) : r( r)
{
}
char* FigureType()
{
return "Circle";
}
double Circumference()
{
return 2 * r * M_PI;
}
double Area()
{
return r * r * M_PI;
}
private:
double r;
};
int _tmain( int argc, _TCHAR* argv[])
{
CFigure* figures[3];
figures[0] = new CTriangle(2. 1, 3. 2, 4. 3);
figures[1] = new CSquare(5. 4, 6. 5);
figures[2] = new CCircle(8. 8);
for (int i = 0; i < 3; i++)
{
cout << "Figure type:\ t" << figures[i]->FigureType()
<< "\nCircumference:\ t" << figures[i]->Circumference()
<< "\nArea:\ t\ t" << figures[i]->Area()
<< endl << endl; }
return 0;
}