ISDIGIT(3)

NAME
isdigit - decimal-digit character test

LIBRARY
libc

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 ansiC.

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.