第六周实验报告（4)

 

#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(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  };    CPoint::CPoint(double xx,double yy)  {      x=xx;      y=yy;  }    void CPoint::input()  {      char c;      cout<<"请输入坐标点(格式x,y )";      while(1)      {          cin>>x>>c>>y;          if (c==',') break;          cout<<"输入格式不正确"<<endl;      }  }    void CPoint::output()  {      cout<<"("<<x<<", "<<y<<")"<<endl;  }    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(void)    {        double a,b,c;a=B.distance(C);b=C.distance(A);c=A.distance(B);     return (a + b + c);    }      double CTriangle::area(void)    {        double a,b,c;a=B.distance(C);b=C.distance(A);c=A.distance(B);      double s;s = (a + b + c) / 2;    return sqrt(s * (s - a) * (s - b) * (s - c));     }     bool CTriangle::isRightTriangle() {      double a,b,c;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() {      double a,b,c;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;  }    void main(void)  {         cout<<"请输入三角形三点坐标"<<endl;CPoint p1,p2,p3;p1.input();p2.input();p3.input();CTriangle  Tri1(p1,p2,p3);    cout<<"该三角形的周长为："<<Tri1.perimeter()<<"，面积为："<<Tri1.area()<<endl<<endl;      cout<<"该三角形"<<(Tri1.isRightTriangle()?"是":"不是")<<"直角三角形"<<endl;      cout<<"该三角形"<<(Tri1.isIsoscelesTriangle()?"是":"不是")<<"等腰三角形"<<endl;      system("pause");  }  

总结：学会了同时使用多个类、