This code is a simple recursion formula used to convert a number in base b to a number in base 10.
Because it's a recursive method (mathematical), it's use is limited to base 10.

usage : convfrom(number in base b, base b to convert from)

ex:

convto(244,6) = 100
because 2*36 + 4*6 + 4*1 = 72 + 24 + 4= 100