项目二

来源：互联网发布：中小学预算编制软件编辑：程序博客网时间：2024/04/30 00:55
#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  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;}// 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<<"输入的数据格式不符合规范，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::distance1(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.distance1(C),b=C.distance1(A),c=A.distance1(B);  return (a + b + c);}double CTriangle::area(void){  double a=B.distance1(C),b=C.distance1(A),c=A.distance1(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.distance1(C),b=C.distance1(A),c=A.distance1(B);  double max=a;  if(b>max) max=b;  if(c>max) max=c;  if(((max==a)&&(abs(a*a-b*b-c*c)<1e-7))||((max==b)&&(abs(b*b-a*a-c*c)<1e-7))||((max==c)&&(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.distance1(C),b=C.distance1(A),c=A.distance1(B);  if((abs(a-b)<1e-7)||(abs(b-c)<1e-7)||(abs(c-a)<1e-7))    return true;  else    return false;}int main(){    CPoint X(2,5),Y(5,2),Z(7,8);    CTriangle Tri1(X,Y,Z);  //定义三角形类的一个实例（对象）    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;    return 0;}
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