第6周实验指导5

#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 distance(CPoint p) const;   // 两点之间的距离
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);//
double perimeter();//计算三角形的周长
double area();//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
};

#include<iostream>
#include"n.h"
using namespace std;
CPoint::CPoint(double xx,double yy)
{
x=xx;
y=yy;
}

// 输入坐标点
void CPoint::input()
{
char ch;
cout<<"请输入坐标点(格式x,y )：";
while(1)
{
cin>>x>>ch>>y;
if (ch==',') break;
cout<<"格式不正确，请重新输入\n";
}
}

// 输出坐标点
void CPoint::output()
{
cout<<"("<<x<<", "<<y<<")"<<endl;
}

// 求两点之间的距离
double CPoint::distance(CPoint p) const
{
double d;
d=sqrt((p.x-x)*(p.x-x)+(p.y-y)*(p.y-y));
return d;
}

void CTriangle::setTriangle(CPoint &X,CPoint &Y,CPoint &Z)
{
A=X;
B=Y;
C=Z;
}

double CTriangle::perimeter()
{
double a=B.distance(C),b=C.distance(A),c=A.distance(B);
return (a + b + c);
}

double CTriangle::area()
{   double a, b, c, s, m ;
a=B.distance(C),b=C.distance(A),c=A.distance(B);
s = (a + b + c) / 2;
m=sqrt(s * (s - a) * (s - b) * (s - c));
return m;
}
//是否为直角三角形
bool CTriangle::isRightTriangle()
{
double a=B.distance(C),b=C.distance(A),c=A.distance(B);
if((abs(a*a-b*b-c*c)<1e-7)||(abs(b*b-a*a-c*c)<1e-7)||(abs(c*c-b*b-a*a)<1e-7))
return true;
else
return false;
}
//是否为等腰三角形
bool CTriangle::isIsoscelesTriangle()
{
double a=B.distance(C),b=C.distance(A),c=A.distance(B);
if((abs(a-b)<1e-7)||(abs(b-c)<1e-7)||(abs(c-a)<1e-7))
return true;
else
return false;
}

#include<iostream>
#include"n.h"
using namespace std;
void main(void)
{
CTriangle Tri1(CPoint(1,3),CPoint(2,0),CPoint(7,2));
cout<<"三角形的周长为："<<Tri1.perimeter()<<"，面积为："<<Tri1.area()<<endl;
cout<<"三角形"<<(Tri1.isRightTriangle()?"是":"不是")<<"直角三角形"<<endl;
cout<<"三角形"<<(Tri1.isIsoscelesTriangle()?"是":"不是")<<"等腰三角形"<<endl;
}