C++求助,求高手帮忙改下程序
c++:建立一个二维坐标系的类TwoCoor，用x、y表示坐标值，实现两坐标点的加、减运算，计算两坐标点间的距离，并重载输入/输出运算符，使之能够直接输入/输出坐标点的坐标值
程序代码：
#include<iostream>
#include<cmath>
using namespace std;
class TwoCoor
{
private:
double x,y;
public:
TwoCoor(double X=0,double Y=0):x(X),y(Y) {};
friend TwoCoor operator+(TwoCoor p1,TwoCoor p2);
friend TwoCoor operator-(TwoCoor p1,TwoCoor p2);
friend double dist(TwoCoor p1,TwoCoor p2);
friend TwoCoor &operator<<(ostream &os,TwoCoor &t);
friend TwoCoor &operator>>(istream &is,TwoCoor &t);
};
TwoCoor operator+(TwoCoor p1,TwoCoor p2)
{
return TwoCoor(p1.x+p2.x,p1.y+p2.y);
}
TwoCoor operator-(TwoCoor p1,TwoCoor p2)
{
return TwoCoor(p1.x-p2.x,p1.y-p2.y);
}
double dist(TwoCoor p1,TwoCoor p2)
{
double x=(p1.x-p2.x);
double y=(p1.y-p1.y);
return sqrt(x*x+y*y);
}
TwoCoor &operator<<(ostream &os,TwoCoor &t)
{
os<<"\t"<<t.x<<"\t";
os<<t.y<<endl;
return t;
}
TwoCoor &operator>>(istream &is,TwoCoor &t)
{
cout<<"坐标点的横坐标:";
is>>t.x;
cout<<"坐标点的纵坐标:";
is>>t.y;
return t;
}
int main()
{
TwoCoor t1,t2;
char select;
while(1)
{
cout<<"------------------坐标点计算系统-----------------------"<<endl;
cout<<" 0 计算两坐标点对应坐标之和 "<<endl;
cout<<" 1 计算两坐标点对应坐标之差 "<<endl;
cout<<" 2 计算两坐标点的距离 "<<endl;
cout<<" 3 退出系统 "<<endl;
cout<<"*******************************************************"<<endl;
cout<<"请输入你的选择:";
cin>>select;
if(select=='0')
{
cout<<"请输入坐标点1的坐标:"<<endl;
cin>>t1;
cout<<"---------------------------------------"<<endl;
cout<<"\t"<<"横坐标"<<"\t"<<"纵坐标"<<endl;
cout<<"点1";
cout<<t1;
cout<<"---------------------------------------"<<endl;
cout<<"请输入坐标点2的坐标:"<<endl;
cin>>t2;
cout<<"---------------------------------------"<<endl;
cout<<"\t"<<"横坐标"<<"\t"<<"纵坐标"<<endl;
cout<<"点2";
cout<<t2;
cout<<"---------------------------------------"<<endl;
cout<<"\t"<<"\t"<<"\t"<<"\t"<<"横坐标"<<"\t"<<"纵坐标"<<endl;
cout<<"两坐标点的对应坐标相加为:"<<operator+(t1,t2);
}
else if(select=='1')
{
cout<<"请输入坐标点1的坐标:"<<endl;
cin>>t1;
cout<<"---------------------------------------"<<endl;
cout<<"\t"<<"横坐标"<<"\t"<<"纵坐标"<<endl;
cout<<"点1";
cout<<t1;
cout<<"---------------------------------------"<<endl;
cout<<"请输入坐标点2的坐标:"<<endl;
cin>>t2;
cout<<"---------------------------------------"<<endl;
cout<<"\t"<<"横坐标"<<"\t"<<"纵坐标"<<endl;
cout<<"点2";
cout<<t2;
cout<<"---------------------------------------"<<endl;
cout<<"\t"<<"\t"<<"\t"<<"\t"<<"横坐标"<<"\t"<<"纵坐标"<<endl;
cout<<"两坐标点的对应坐标相减为:"<<operator-(t1,t2);
}
else if(select=='2')
{
cout<<"请输入坐标点1的坐标:"<<endl;
cin>>t1;
cout<<"---------------------------------------"<<endl;
cout<<"\t"<<"横坐标"<<"\t"<<"纵坐标"<<endl;
cout<<"点1";
cout<<t1;
cout<<"---------------------------------------"<<endl;
cout<<"请输入坐标点2的坐标:"<<endl;
cin>>t2;
cout<<"---------------------------------------"<<endl;
cout<<"\t"<<"横坐标"<<"\t"<<"纵坐标"<<endl;
cout<<"点2";
cout<<t2;
cout<<"---------------------------------------"<<endl;
cout<<"两坐标点的距离为:"<<dist(t1,t2)<<endl;
}
else if(select=='3')
exit(0);
else
{
cout<<"输入错误，请重新输入"<<endl;
continue;
}
}
}
!!!!!!
