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NetBSD 6.1.5 - man page for isdigit (netbsd section 3)

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ISDIGIT(3)			   BSD Library Functions Manual 		       ISDIGIT(3)

NAME
     isdigit -- decimal-digit character test

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <ctype.h>

     int
     isdigit(int c);

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

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

SEE ALSO
     ctype(3), 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 C89'').

CAVEATS
     The argument to isdigit() must be EOF or representable as an unsigned char; otherwise, the
     behavior is undefined.  See the CAVEATS section of ctype(3) for more details.

BSD					  April 17, 2008				      BSD
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