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		+	+	+