[#conf_method_st-is_number]
= xref:conf_method_st.adoc[conf&lowbar;method&lowbar;st]::is&lowbar;number
:relfileprefix: ../
:mrdocs:

Return non&hyphen;zero if `c` is a digit in this CONF method&apos;s number syntax&period;

== Synopsis

Declared in `&lt;openssl&sol;conftypes&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int(* is&lowbar;number)(xref:CONF.adoc[CONF] const*, char);
----


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