isdigit(3) - NetBSD Manual Pages

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ISDIGIT(3)                NetBSD 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

     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'').

4.4BSD                           June 29, 1991                               1