Originální popis anglicky:
isdigit - test for a decimal digit
Návod, kniha: POSIX Programmer's Manual
#include <ctype.h>
int isdigit(int
c);
The
isdigit() function shall test whether
c is a character of
class
digit in the program's current locale; see the Base Definitions
volume of IEEE Std 1003.1-2001, Chapter 7, Locale.
The
c argument is an
int, the value of which the application shall
ensure is a character representable as an
unsigned char or equal to the
value of the macro EOF. If the argument has any other value, the behavior is
undefined.
The
isdigit() function shall return non-zero if
c is a decimal
digit; otherwise, it shall return 0.
No errors are defined.
The following sections are informative.
None.
To ensure applications portability, especially across natural languages, only
this function and those listed in the SEE ALSO section should be used for
character classification.
None.
None.
isalnum() ,
isalpha() ,
iscntrl() ,
isgraph() ,
islower() ,
isprint() ,
ispunct() ,
isspace() ,
isupper() ,
isxdigit() , the Base Definitions volume of
IEEE Std 1003.1-2001, Chapter 7, Locale,
<ctype.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
