isdigit(3) - NetBSD Manual Pages

ISDIGIT(3)                NetBSD Programmer's 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() macro returns zero if the character tests false and returns non-zero if the character tests true.
SEE ALSO
isalnum(3), isalpha(3), isascii(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3), toascii(3), tolower(3), toupper(3), stdio(3), ascii(7)
STANDARDS
The isdigit() function conforms to ANSI X3.159-1989 (``ANSI C''). NetBSD 1.4 June 29, 1991 1

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