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Technical Reference: Base Operating System and Extensions , Volume 2

towlower Subroutine


Converts an uppercase wide character to a lowercase wide character.


Standard C Library (libc.a)


#include  <wchar.h>

wint_t towlower ( WC)
wint_t WC;


The towlower subroutine converts the uppercase wide character specified by the WC parameter into the corresponding lowercase wide character. The LC_CTYPE category affects the behavior of the towlower subroutine.


WC Specifies the wide character to convert to lowercase.

Return Values

If the WC parameter contains an uppercase wide character that has a corresponding lowercase wide character, that wide character is returned. Otherwise, the WC parameter is returned unchanged.

Implementation Specifics

This subroutine is part of Base Operating System (BOS) Runtime.

Related Information

The iswalnum subroutine, iswalpha subroutine, iswcntrl subroutine, iswctype subroutine, iswdigit subroutine, iswgraph subroutine, iswlower subroutine, iswprint subroutine, iswpunct subroutine, iswspace subroutine, iswupper subroutine, iswxdigit subroutine, setlocale (setlocale Subroutine) subroutine, towupper (towupper Subroutine) subroutine, wctype (wctype or get_wctype Subroutine) subroutine.

National Language Support Overview for Programming, Subroutines Overview, Understanding Wide Character Classification Subroutines in AIX 5L Version 5.1 General Programming Concepts: Writing and Debugging Programs.

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