[#BN_clear_bit]
= BN_clear_bit
:mrdocs:

Clear bit `n` of BIGNUM `a.`

== Synopsis

Declared in `<openssl/bn.h>`

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

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| BIGNUM to modify.
| *n*
| Zero‐based bit index to clear.
|===


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