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isdigit(3)

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RocketLink!--> Man page versions: OpenBSD FreeBSD Others

[ANSI C X3.159-1989]

ISDIGIT(3)                OpenBSD Programmer's Manual               ISDIGIT(3)

NAME
     isdigit - decimal-digit character test



SYNOPSIS
     #include <ctype.h>

     int
     isdigit(int c);

DESCRIPTION
     The isdigit() function tests for any decimal-digit character.

RETURN VALUES
     The isdigit() macro returns zero if the character tests false or non-zero
     if the character tests true.

SEE ALSO
     isalnum(3),  isalpha(3),  isascii(3),  isblank(3),  iscntrl(3),
     isgraph(3),  islower(3),  isprint(3),  ispunct(3),  isspace(3),
     isupper(3),  isxdigit(3),  stdio(3),  toascii(3),  tolower(3),
     toupper(3),  ascii(7)

STANDARDS
     The isdigit() function conforms to ANSI X3.159-1989 (``ANSI C'').

OpenBSD 2.6                      June 29, 1991                               1

Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.

(Corrections, notes, and links courtesy of RocketAware.com)

Behavior when (ch & 0x80) not portable. (Linux, WIN16 and WIN32 false; Solaris undefined when signed char)
setlocale(3), when provided, may change the behavior.
Often provided as both a function and a macro. #undef the macro to access the function version.

[Detailed Topics]

FreeBSD Sources for isdigit(3) functions
OpenBSD sources for isdigit(3)

[Overview Topics]

Up to: Character Tests and Operations - isblank, toupper, etc.

RocketLink!--> Man page versions: OpenBSD FreeBSD Others

[ANSI C X3.159-1989]

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