| 0,0 → 1,43 |
|---|
| /* |
| FUNCTION |
| <<isdigit>>---decimal digit predicate |
| |
| INDEX |
| isdigit |
| |
| ANSI_SYNOPSIS |
| #include <ctype.h> |
| int isdigit(int <[c]>); |
| |
| TRAD_SYNOPSIS |
| #include <ctype.h> |
| int isdigit(<[c]>); |
| |
| DESCRIPTION |
| <<isdigit>> is a macro which classifies ASCII integer values by table |
| lookup. It is a predicate returning non-zero for decimal digits, and 0 for |
| other characters. It is defined only when <<isascii>>(<[c]>) is true |
| or <[c]> is EOF. |
| |
| You can use a compiled subroutine instead of the macro definition by |
| undefining the macro using `<<#undef isdigit>>'. |
| |
| RETURNS |
| <<isdigit>> returns non-zero if <[c]> is a decimal digit (<<0>>--<<9>>). |
| |
| PORTABILITY |
| <<isdigit>> is ANSI C. |
| |
| No supporting OS subroutines are required. |
| */ |
| |
| #include <_ansi.h> |
| #include <ctype.h> |
| |
| |
| #undef isdigit |
| int |
| _DEFUN(isdigit,(c),int c) |
| { |
| return(__ctype_ptr__[c+1] & _N); |
| } |