第十三周项目一-点与圆的位置关系

#include <iostream>
#include <cmath>
using namespace std;
class point
{
protected:
double x,y;
public:
point(double xx,double yy):x(xx),y(yy){}
double getx()
{
return x;
}
double gety()
{
return y;
}
~point()
{

}
friend ostream& operator <<(istream &putout,point &c);
};
ostream& operator <<(ostream &putout,point &c)
{
putout<<"("<<c.getx()<<","<<c.gety()<<")"<<endl;
return putout;
}
class circle:public point
{
private:
double r;
public:
circle(double xx,double yy,double rr):
point(xx,yy),r(rr){}
~circle()
{

}
friend ostream& operator <<(ostream &putout,circle &c);
friend double locate(point &a,circle &b);
};
ostream& operator <<(ostream &putout,circle &c)
{
putout<<"("<<c.getx()<<","<<c.gety()<<")"<<endl;
putout<<"半径"<<c.r<<endl;
return putout;
}
double locate(point &a,circle &b)
{
double num,d;
d=sqrt(pow(a.getx()-b.getx(),2)+pow(a.gety()-b.gety(),2));
if(d>b.r)
num=1;
else if(d==b.r)
num=0;
else
num=-1;
return num;

}

int main( )
{
circle c1(3,2,4),c2(4,5,5);      //c2应该大于c1
point p1(1,1),p2(3,-2),p3(7,3);  //分别位于c1内、上、外
cout<<"圆c1: "<<c1;
cout<<"点p1: "<<p1;
cout<<"点p1在圆c1之"<<((locate(p1, c1)>0)?"外":((locate(p1, c1)<0)?"内":"上"))<<endl;
cout<<"点p2: "<<p2;
cout<<"点p2在圆c1之"<<((locate(p2, c1)>0)?"外":((locate(p2, c1)<0)?"内":"上"))<<endl;
cout<<"点p3: "<<p3;
cout<<"点p3在圆c1之"<<((locate(p3, c1)>0)?"外":((locate(p3, c1)<0)?"内":"上"))<<endl;
return 0;
}