In the `num`

crate, it defines a private function called `get_radix_base`

. What is the meaning of this function?

# What does the `get_radix_base` function do?

**photino**#1

**lifthrasiir**#2

It is an internal function for `to_str_radix`

which prints a number in given base.

Printing a binary bignum in the non-binary base `b`

(including decimal) is quite a daunting task, and while very rudimentary, `num`

crate uses a repeated division by some power of the base (`b^k`

) to get the lowest `k`

digits at a time. We want to maximize `b^k`

as long as it does not exceed one internal digit (“limb”, a type `BigDigit`

there) so that we can easily divide by `b^k`

. Consequently `get_radix_base(b)`

returns `(maximal b^k, k in that case)`

.