第六周任务（4）

#include <iostream>#include <cmath>using namespace std;enum SymmetricStyle { axisx,axisy,point};//分别表示按x轴, y轴, 原点对称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(一点是当前点，另一点为参数p)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(void);//计算三角形的周长double 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};//CTriangle::CTriangle(CPoint &X,CPoint &Y,CPoint &Z):A(X),B(Y),C(Z){} //给出三点的构造函数void CTriangle::setTriangle(CPoint &X,CPoint &Y,CPoint &Z){A=X;B=Y;C=X;}double CTriangle::perimeter(void)//计算三角形的周长{double a=B.Distance(C),b=C.Distance(A),c=A.Distance(B);return (a+b+c);}double CTriangle:: area(void)//计算并返回三角形的面积{double a=B.Distance(C),b=C.Distance(A),c=A.Distance(B);double s=((a+b+c)/2);    return sqrt(s*(s-a)*(s-b)*(s-c));}bool CTriangle::isRightTriangle()//是否为直角三角形{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;  }  bool CTriangle::isIsoscelesTriangle()//是否为等腰三角形{double a=B.Distance(C),b=C.Distance(A),c=A.Distance(B);    if((abs(a-b)<1e-7)||(abs(a-c)<1e-7)||(abs(c-b)<1e-7))          return true;      else          return false;  }  CPoint::CPoint(double xx,double yy):x(xx),y(yy){}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 CPoint::input(){char c;cout<<"请输入坐标点（形式为x，y）"<<endl;cin>>x>>c>>y;if(c!=','){cout<<"输入错误"<<endl;exit(1);}}void CPoint::output(){cout<<x<<","<<y<<endl;}void main(){CTriangle p(CPoint(3,5),CPoint(5,6),CPoint(10,8));    cout<<"三角形周长："<<p.perimeter()<<"  "<<"三角型面积："<<p.area()<<endl;    cout<<"该三角形"<<(p.isRightTriangle()?"是":"不是")<<"直角三角形"<<endl;      cout<<"该三角形"<<(p.isIsoscelesTriangle()?"是":"不是")<<"等腰三角形"<<endl;      system("pause"); }