December 2005
Beginner to intermediate
618 pages
20h 19m
English
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Name
iscntrl
Synopsis
Ascertains whether a given character is a control character
#include <ctype.h> intiscntrl( intc);
The function iscntrl()
tests whether its character argument is a control character. For the
ASCII character set, these are the character codes from 0 through 31
and 127. The function may yield different results depending on the
current locale setting for the localization category LC_CTYPE, which you can query or change
using the setlocale()
function.
If the argument is a control character, iscntrl() returns a nonzero value (that
is, true); if not, the function
returns 0 (false).
Example
See the example for isprint() in this
chapter.
See Also
The corresponding C99 function for wide characters, iswcntrl(); isalnum(), isalpha(), isblank(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(), isupper(), isxdigit(), setlocale()
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.