[#BN_num_bits_word]
= BN_num_bits_word
:mrdocs:

Return the number of significant bits in a single BN_ULONG word.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_num_bits_word(unsigned long l);
----

== Return Value

Bit length of `l` (floor(log2(`l))+1` when `l` != 0).

== Parameters

[cols="1,4"]
|===
| Name| Description
| *l*
| Word value to measure; zero yields 0.
|===


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