  The present article is devoted to functions from a certain subclass of
non-differentiable functions. The arguments and values of considered functions
represented by the s-adic representation or the nega-s-adic representation of
real numbers. The technique of modeling such functions is the simplest as
compared with well-known techniques of modeling non-differentiable functions.
In other words, values of these functions are obtained from the s-adic or
nega-s-adic representation of the argument by a certain change of digits or
combinations of digits.
