[#BloombergLP-bdlb-CharType-stringCntrl]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/CharType.adoc[CharType]::stringCntrl
:relfileprefix: ../../../
:mrdocs:

Return all `CNTRL` characters as a null‐terminated string.

== Synopsis

Declared in `<bdlb_chartype.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
char const*
stringCntrl();
----

== Description

Return a null‐terminated string consisting of all characters in the category `CNTRL` (i.e., `[0‐37]` and `177`), ordered by increasing character codes. Note that this string, if printed, may appear to be of length 0 because the `NULL` character is part of the set and appears first.

== Return Value

null‐terminated string of all `CNTRL` characters


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