public Complex subtract (final Complex z)
  {
    return new Complex (m_fReal - z.real (), m_fImaginary - z.imaginary ());
  }
public Complex subtract ( final Complex z ) { return new Complex ( m_fReal - z . real ( ) , m_fImaginary - z . imaginary ( ) ) ; }
Subtract another complex number from this one.

@param z
the other complex number
@return a new complex number that is the difference