第五周 项目三-多文件组织多个类

main.cpp

#include <iostream>
#include "header.h"
using namespace std;
int main()
{
    CPoint X(2,5),Y(5,2),Z(7,8);
    CTriangle Tri1(X,Y,Z);
    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;
}

header.cpp

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

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";
  }
}

void CPoint::output()
{
  cout<<"("<<x<<", "<<y<<")"<<endl;
}

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()
{
  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()
{
  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;
}

header.h

#ifndef HEADER_H_INCLUDED
#define HEADER_H_INCLUDED

class CPoint
{
private:
  double x;
  double y;
public:
  CPoint(double xx=0,double yy=0);
  double distance1(CPoint p) const;
  void input();
  void output();
};

class CTriangle
{
public:
  CTriangle(CPoint &X,CPoint &Y,CPoint &Z):A(X),B(Y),C(Z){}
  void setTriangle(CPoint &X,CPoint &Y,CPoint &Z);
  double perimeter(void);
  double area(void);
  bool isRightTriangle();
  bool isIsoscelesTriangle();
private:
  CPoint A,B,C;
};

#endif // HEADER_H_INCLUDED

运行结果：

学习心得：

好好学习 天天向上