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ISWALPHA

Section: Linux Programmer's Manual (3)
Updated: 1999-07-25
Index Return to Main Contents

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NAME

iswalpha - test for alphabetic wide character  

SYNOPSIS

#include <wctype.h>

int iswalpha(wint_t wc);

 

DESCRIPTION

The iswalpha() function is the wide-character equivalent of the isalpha(3) function. It tests whether wc is a wide character belonging to the wide-character class "alpha".

The wide-character class "alpha" is a subclass of the wide-character class "alnum", and therefore also a subclass of the wide-character class "graph" and of the wide-character class "print".

Being a subclass of the wide-character class "print", the wide-character class "alpha" is disjoint from the wide-character class "cntrl".

Being a subclass of the wide-character class "graph", the wide-character class "alpha" is disjoint from the wide-character class "space" and its subclass "blank".

Being a subclass of the wide-character class "alnum", the wide-character class "alpha" is disjoint from the wide-character class "punct".

The wide-character class "alpha" is disjoint from the wide-character class "digit".

The wide-character class "alpha" contains the wide-character classes "upper" and "lower".

The wide-character class "alpha" always contains at least the letters 'A' to 'Z' and 'a' to 'z'.  

RETURN VALUE

The iswalpha() function returns nonzero if wc is a wide character belonging to the wide-character class "alpha". Otherwise it returns zero.  

CONFORMING TO

C99.  

NOTES

The behavior of iswalpha() depends on the LC_CTYPE category of the current locale.  

SEE ALSO

isalpha(3), iswctype(3)  

COLOPHON

This page is part of release 3.35 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://man7.org/linux/man-pages/.

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Index

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

CONFORMING TO

NOTES

SEE ALSO

COLOPHON

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