iscntrl, iswcntrl
Remonter à Ctype.h - Index
Header File
ctype.h
Category
Classification Routines
Prototype
int iscntrl(int c);
int iswcntrl(wint_t c);
Description
Tests for a control character.
iscntrl is a macro that classifies ASCII-coded integer values by table lookup. The macro is affected by the current locale’s LC_CTYPE category. For the default C locale, c is a delete character or control character (0x7F or 0x00 to 0x1F).
You can make this macro available as a function by undefining (#undef) it.
Return Value
iscntrl returns nonzero if c is a delete character or ordinary control character.
Example
#include <stdio.h>
#include <ctype.h>
int main(void)
{
char c = 'C';
if (iscntrl(c))
printf("%c is a control character\n",c);
else
printf("%c is not a control character\n",c);
return 0;
}
Portability
POSIX | Win32 | ANSI C | ANSI C++ | |
---|---|---|---|---|
iscntrl |
+ |
+ |
+ |
+ |
iswcntrl |
+ |
+ |
+ |