#include<iostream.h>
#include<math.h>
class Fushu
{
private:
	float r,v;
public:
	Fushu(float rr=0,float vv=0){r=rr;v=vv;}
	float get_r(){return r;}
	float get_v(){return v;}
	Fushu operator+(Fushu f1);
	friend Fushu operator-(Fushu f1,Fushu f2);
	Fushu operator++();
	Fushu operator--(int);
	bool operator>(Fushu f1);
	void Display(){if(v>=0) cout<<r<<"+"<<v<<"i"<<" ";
	if(v<0) cout<<r<<"-"<<-v<<"i"<<" ";cout<<endl;}
};
Fushu Fushu::operator+(Fushu f1)
{return Fushu(r+f1.r,v+f1.v);}
Fushu operator-(Fushu f1,Fushu f2)
{return Fushu(f1.r-f2.r,f1.v-f2.v);}
Fushu Fushu::operator++()
{ return Fushu(++r,++v);}
Fushu Fushu::operator--(int)
{return Fushu(r--,v--);}
bool Fushu::operator>(Fushu f1)
{if(r*r+v*v>f1.r*f1.r+f1.v*f1.v) return 1;
 else return 0;}
void main()
{ Fushu f1(1,2),f2(3,4),f3(5,-7),f4,f5;
  cout<<"f1=";f1.Display();
  cout<<"f2=";f2.Display();
  cout<<"f3=";f3.Display();
  f4=f2-f1;
  f5=f2+f3;
  cout<<"f4=f2-f1=";f4.Display();
  cout<<"f5=f2+f3=";f5.Display();
  if(f1>f3)cout<<"f1>f3"<<endl;
  if(!(f1>f3))cout<<"f1<=f3"<<endl;
  ++f1;
  cout<<"對f1執行前置++操作后f1=";f1.Display();
  f2--;
  cout<<"對f2執行后置--操作后f2=";f2.Display();
}