坐标求三角形类

#include <iostream>

#include <cmath>

using namespace std;

class CPoint
{
private:
  double x;  // 横坐标
  double y;  // 纵坐标
public:
  CPoint(double xx=0,double yy=0);
  double Distance1(CPoint p) const;   // 两点之间的距离(一点是当前点，另一点为参数p)
  double Distance0() const;            // 到原点的距离
  void input();  //以x,y 形式输入坐标点
  void output(); //以(x,y) 形式输出坐标点
};
class CTriangle
{
public:
	CTriangle(CPoint &X,CPoint &Y,CPoint &Z):A(X),B(Y),C(Z){} //给出三点的构造函数
	void setTriangle(CPoint &X,CPoint &Y,CPoint &Z);//
	float perimeter(void);//计算三角形的周长
	float area(void);//计算并返回三角形的面积
	bool isRightTriangle(); //是否为直角三角形
	bool isIsoscelesTriangle(); //是否为等腰三角形
private:
	CPoint A,B,C; //三顶点
};
CPoint::CPoint(double xx,double yy)
{
    x=xx;
    y=yy;
}
double CPoint::Distance1(CPoint p) const
{
    double l;
    l=sqrt((x-p.x)*(x-p.x)+(y-p.y)*(y-p.y));
    return l;
}
double CPoint::Distance0() const
{
    double l;
    l=sqrt(x*x+y*y);
    return l;
}
void CPoint::input()
{
    int a,b;
    cout<<"输入坐标x，y"<<endl;
    cin>>a>>b;
    x=a;
    y=b;
}
void CPoint::output()
{
    cout<<'('<<x<<","<<y<<')'<<endl;
}
int main ()
{
    CPoint X,Y,Z;
    X.input();
    Y.input();
    Z.input();
    CTriangle T1(X,Y,Z);
    cout<<"该三角形的周长为："<<T1.perimeter()<<"，面积为："<<T1.area()<<endl<<endl;
    cout<<"该三角形"<<(T1.isRightTriangle()?"是":"不是")<<"直角三角形"<<endl;
    cout<<"该三角形"<<(T1.isIsoscelesTriangle()?"是":"不是")<<"等腰三角形"<<endl;
}
void CTriangle::setTriangle(CPoint &X,CPoint &Y,CPoint &Z)
{
    A=X;
    B=Y;
    C=Z;
}
float CTriangle::perimeter(void)
{
    float a,b,c;
    c=A.Distance1(B);
    a=B.Distance1(C);
    b=C.Distance1(A);
    return a+b+c;
}
float CTriangle::area(void)
{
    float a,b,c,s;
    c=A.Distance1(B);
    a=B.Distance1(C);
    b=C.Distance1(A);
    s=(a+b+c)/2;
    return sqrt(s*(s-a)*(s-b)*(s-c));
}
bool CTriangle::isRightTriangle()
{
    float a,b,c;
    c=A.Distance1(B);
    a=B.Distance1(C);
    b=C.Distance1(A);
    if(a*a+b*b==c*c)
    return 1;
    else if(a*a+c*c==b*b)
    return 1;
    else if(c*c+b*b==a*a)
    return 1;
    else
    return 0;
}
bool CTriangle::isIsoscelesTriangle()
{
    float a,b,c;
    c=A.Distance1(B);
    a=B.Distance1(C);
    b=C.Distance1(A);
    if(a==b||b==c||a==c)
    return 1;
    else
    return 0;
}