ISDIGIT(3) BSD Library Functions Manual ISDIGIT(3)NAMEisdigit — decimal-digit character test
SYNOPSIS
#include <ctype.h>
int
isdigit(int c);;
DESCRIPTION
The isdigit() function tests for any decimal-digit character. In the
ASCII character set, this includes the following characters:
060 ``0'' 061 ``1'' 062 ``2'' 063 ``3'' 064 ``4''
065 ``5'' 066 ``6'' 067 ``7'' 070 ``8'' 071 ``9''
RETURN VALUES
The isdigit() function returns zero if the character tests false and
returns non-zero if the character tests true.
SEE ALSOctype(3), ascii(7)STANDARDS
The isdigit() function conforms to ANSI X3.159-1989 (“ANSI C89”).
BSD June 4, 1993 BSD