Calculate and plot the Fourier series of a function in C++, using graphics.h BGI library

It transforms a periodic function f(t), to its respective Fourier series (The same function but represented in an infinite sum of Sines and Cosines of different frequency) very useful to visualize how many terms of the Fourier Series are needed to approximate the original function.

HISTORY

• Version 2 – 26-III-2024
  • Update graphics/fourier – Porting to VC++ 2017 using winbgi
  • The fourier series approximation with up to 15 terms is added for the following functions: “Step Function”, “sqrt(1 – t^2)”, “0.1(t + 2)(t + 1)* t(t – 1)(t – 3)” and “t^3
• Version 1 – 8-XI-1999
  • First version for Borland C++ 3.1 and Turbo C 3.0