isdigit(3) - NetBSD Manual Pages

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ISDIGIT(3)              NetBSD 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() 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), 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 C'').


CAVEATS

     The argument to isdigit() must be EOF or representable as an unsigned
     char; otherwise, the result is undefined.

NetBSD 2.0.2                     June 29, 1991                    NetBSD 2.0.2