title: Representation of complex numbers in C++ for Discrete Fourier Transformation
body: <p>I am currently writing a small tool which should help me check whether my manually calculated fourier vectors are correct. Now i need the n-th Root of Unity specified by <code>omega = exp(2*pi*i / n)</code>. Can somebody explain me how to represent this <code>omega</code> as a <code>complex</code> in C++?</p>