1 .\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
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10 .\" References consulted:
11 .\" GNU glibc-2 source code and manual
12 .\" Dinkumware C library reference http://www.dinkumware.com/
13 .\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
16 .TH ISWDIGIT 3 1999-07-25 "GNU" "Linux Programmer's Manual"
18 iswdigit \- test for decimal digit wide character
21 .B #include <wctype.h>
23 .BI "int iswdigit(wint_t " wc );
28 function is the wide-character equivalent of the
31 It tests whether \fIwc\fP is a wide character
32 belonging to the wide-character class "digit".
34 The wide-character class "digit" is a subclass of the wide-character class
35 "xdigit", and therefore also a subclass
36 of the wide-character class "alnum", of
37 the wide-character class "graph" and of the wide-character class "print".
39 Being a subclass of the wide character
40 class "print", the wide-character class
41 "digit" is disjoint from the wide-character class "cntrl".
43 Being a subclass of the wide-character class "graph",
44 the wide-character class
45 "digit" is disjoint from the wide-character class "space" and its subclass
48 Being a subclass of the wide-character
49 class "alnum", the wide-character class
50 "digit" is disjoint from the wide-character class "punct".
52 The wide-character class "digit" is
53 disjoint from the wide-character class
54 "alpha" and therefore also disjoint from its subclasses "lower", "upper".
56 The wide-character class "digit" always
57 contains exactly the digits \(aq0\(aq to \(aq9\(aq.
61 function returns nonzero
62 if \fIwc\fP is a wide character
63 belonging to the wide-character class "digit".
64 Otherwise it returns zero.