Complex::Complex(){r=0;i=0;}
Complex::Complex(int pr, int pi){r=pr; i=pi;}
void Complex::set(int pr, int pi){r=pr;i=pi;}
double Complex::modul(){ return sqrt(r*r+i*i);}
int Complex::real(){return r;}
int Complex::imag(){return i;}
ostream& operator<<(ostream& out, const Complex& c)
{
    if(c.r!=0 || c.i==0) out<<c.r;
    if(c.i>0 && c.r!=0) out<<"+";
    if(c.i!=0) out<<c.i<<"i";
    return out;
}
Complex Complex::operator +(Complex b)
{
    Complex c;
    c.set(this->r+b.real(),this->i+b.imag());
    return c;
}
Complex Complex::operator -(Complex b)
{
    Complex c;
    c.set(this->r-b.real(),this->i-b.imag());
    return c;
}
Complex Complex::operator *(Complex b)
{
    Complex c;
    c.set(this->r*b.real()-this->i*b.imag(),this->i*b.real()+this->r*b.imag());
    return c;
}