坐标 

 1 #ifndef HEADER_PPOINT//头文件卫士
 2  #define HEADER_PPOINT
 3  class PPoint
 4  {
 5      double x,y;//直角坐标或极坐标
 6  public:
 7      PPoint(double ix,double iy);//设置坐标
 8      double xOffset();//设置轴分量x
 9      double yOffset();//设置y轴分量
10      double angle();//极坐标弧角
11      double radius();//极坐标半径
12  };
13  #endif//HEADER_PPOINT
14  //---------------------------------------
15  #include"ppoint.h"
16  #include<iostream>
17  using namespace std;
18  int main()
19  {
20      for(double x,y;cout<<"Enter x and y:\n"&&cin>>x>>y&&x>=0;)//
21      {
22          PPoint p(x,y);
23          cout<<"angle="<<p.angle()<<",radius="<<p.radius()<<",xOffset="<<p.xOffset()<<",yOffset"<<p.yOffset()<<"\n";
24      }
25  }
26  //-------------------------------
27  #include"ppoint.h"
28  #include<cmath>
29  using namespace std;
30  PPoint::PPoint(double ix,double iy)
31  {
32      x=ix,y=iy;
33  }
34  double PPoint::xOffset()
35  {
36      return x;
37  }
38  double PPoint::yOffset()
39  {
40      return y;
41  }
42  double PPoint::angle()
43  {
44      return (180/3.14159)*atan2(y,x);//atan2得到的是弧度
45  }
46  double PPoint::radius()
47  {
48      return sqrt(x*x+y*y);
49  }

 

posted @ 2013-04-29 11:15  herizai  阅读(169)  评论(0)    收藏  举报