{
cout <<real <<(img>=0?"+":"") <<img <<"i";//适合显示1-3i等虚部为负值的复数
}
void Complex::set(Complex &a)
{
real=a.real;
img=a.img;
}
Complex Complex::plus(Complex a)
{
Complex temp(a.real+real,a.img+img);
return temp;
}
Complex Complex::minus(Complex a)
{
Complex temp(real-a.real,img-a.img);
return temp;
}
Complex Complex::plus(double r)
{
