Hi All

I am having a go at a small program to draw a fractal, though I am not sure on how to represent the
imaginary part of the complex number.

Most examples I have seen use a pair of doubles, though I can't see how they are representing i.

The one I am looking at now is coded in C++ as

// Function that multiplies two complex numbers
   // the result is a modified object of the class (this)

   void Multiply(Complex_Number comp_num)
   {
       double temp_a;
      double temp_b;
      temp_a = this->a * comp_num.a;
      temp_a += (this->b * comp_num.b)*(-1);

      temp_b = this->a * comp_num.b;
      temp_b += this->b * comp_num.a;

      this->a = temp_a;
      this->b = temp_b;
   }


then multiplying the b value by -1. I thought only

was equal to -1.

It's probably just me being thick, though if someone could explain how this is working
that would be cool.

Thanks

David