#include <cmath>

#include <iostream.h>

class CComplex

{

#define err 0.00000001

double _x,_y;

public:

CComplex(double x=0,double y=0):_x(x),_y(y){}

CComplex operator+(const CComplex&z);

CComplex operator*(const CComplex&z);

friend ostream&operator <<(ostream&os,const CComplex&z);

friend istream&operator >>(istream&is,CComplex&z);

};

int main()

{

CComplex z1(0,1.2);

CComplex z2(1,1.2);

cout<<z1+z2<<endl;

cout<<z1*z2<<endl;

cin>>z1;

cout<<z1<<endl;

return 0;

}

CComplex CComplex::operator+(const CComplex&z)

{

CComplex c;

c._x=_x+z._x;

c._y=_y+z._y;

return c;

}

CComplex CComplex::operator*(const CComplex&z)

{

CComplex c;

c._x=_x*z._x-_y*z._y;

c._y=_x*z._y+_y*z._x;

return c;

}

ostream&operator <<(ostream&os,const CComplex&z)

{

if(fabs(z._x)>err)

cout<<z._x;

if(fabs(z._y-1)<err)

cout<<(fabs(z._x)>err?"+i":"i");

else if(fabs(z._y+1)<err)

cout<<"-i";

else if(z._y >err)

cout<<(fabs(z._x)>err?"+":"")<<z._y<<" i";

else if(z._y<-err)

cout<<z._y<<" i";

return os;

}

istream&operator >>(istream&is,CComplex&z)

{

is>>z._x>>z._y;

return is;

}