#include<iostream>
#include<fstream>
using namespace std;
class complex{
private:
double re,im;
public:
complex():re(0.0),im(0.0){}
complex(double r, double i):re(r),im(i){}
complex(double r):re(r),im(0.0){}
double getRe()const{return re;}
double getIm()const{return im;}
complex operator+(const complex &);
complex& operator+=(const complex &);
complex operator-(const complex &);
complex& operator-=(const complex &);
complex operator*(const complex &);
complex& operator*=(const complex &);
complex operator/(const complex &);
complex& operator/=(const complex &);
friend ostream & operator <<(ostream &out, const complex &c);
friend istream & operator >>(istream &in, complex &c);
};
ostream & operator <<(ostream &out, const complex &c){
if(c.re!=0) out<<c.re;
if(c.im>0) out<<"+";
if(c.im!=0) out<<c.im<<"i";
return out;
}
istream & operator >>(istream &in, complex &c){
in>>c.re;
in>>c.im;
return in;
}
complex  complex::operator+(const complex &c){
return complex(re+c.re,im+c.im);
}
complex & complex::operator+=(const complex &c){
re+=c.re;
im+=c.im;
return *this;
}
complex complex::operator-(const complex &c){
return complex(re-c.re,im-c.im);
}
complex & complex::operator-=(const complex &c){
re-=c.re;
im-=c.im;
return *this;
}
complex complex::operator*(const complex &c){
double re1,im1;
re1=re*c.re-im*c.im;
im1=re*c.im+c.re*im;
return complex(re1,im1);}
complex & complex::operator*=(const complex &c){
double re1,im1;
re1=re*c.re-im*c.im;
im1=re*c.im+c.re*im;
re=re1;
im=im1;
return *this;}
complex complex::operator/(const complex &c){
double re1,im1;
re1=(re*c.re + im*c.im) / (c.re*c.re + c.im*c.im);
im1=(im*c.re - re*c.im) / (c.re*c.re + c.im*c.im);
return complex(re1,im1);
}
complex & complex::operator/=(const complex &c){
double re1,im1;
re1=(re*c.re + im*c.im) / (c.re*c.re + c.im*c.im);
im1=(im*c.re - re*c.im) / (c.re*c.re + c.im*c.im);
re=re1;
im=im1;
return *this;
}
void main(){
complex c,c1(5),c2(3,2),c3(1,-2),c4(0,4),c5;
ofstream out("t1.txt");ifstream in("t2.txt");
cout<<"-->";
cin>>c;
cout<<c<<endl;
in>>c5;
cout<<c5<<endl;
out<<"operator +:"<<endl;
c=c4+c3;
out<<"("<<c4<<")+("<<c3<<")"<<"="<<c<<endl;
out<<"operator -:"<<endl;
c=c1-c2;
out<<"("<<c1<<")-("<<c2<<")"<<"="<<c<<endl;
out<<"operator *:"<<endl;
c=c1*c3;
out<<"("<<c1<<")*("<<c3<<")"<<"="<<c<<endl;
out<<"operator /:"<<endl;
c=c2/c3;
out<<"("<<c2<<")/("<<c3<<")"<<"="<<c<<endl;
out<<"operator +=:"<<endl;
out<<"("<<c4<<")+("<<c3<<")"<<"=";
c3+=c4;
out<<c3<<endl;
out<<"operator -=:"<<endl;
out<<"("<<c2<<")-("<<c1<<")"<<"=";
c2-=c1;
out<<c2<<endl;
out<<"operator *=:"<<endl;
out<<"("<<c3<<")*("<<c1<<")"<<"=";
c3*=c1;
out<<c3<<endl;
out<<"operator /=:"<<endl;
out<<"("<<c3<<")/("<<c2<<")"<<"=";
c3/=c2;
out<<c3<<endl;
}