ISDIGIT(3)                  BSD 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 and returns
     non-zero if the character tests true.

SEE ALSO
     isascii(3),  isalnum(3),  isalpha(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 C3.159-1989 (``ANSI C'').

BSDI BSD/386                    March 26, 1993                               1