[#BN_is_bit_set]
= BN_is_bit_set
:mrdocs:

Test whether bit `n` of a BIGNUM is set.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_is_bit_set(
    xref:BIGNUM.adoc[BIGNUM] const* a,
    int n);
----

== Return Value

1 if the bit is set, or 0 otherwise.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| Value to test.
| *n*
| Bit index (0 is the least‐significant bit).
|===


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