Warning: main(/www/www/htdocs/style/globals.php) [function.main]: failed to open stream: No such file or directory in /www/www/docs/6.4.1/neutrino/lib_ref/i/iscntrl.html on line 1
Warning: main() [function.include]: Failed opening '/www/www/htdocs/style/globals.php' for inclusion (include_path='.:/www/www/common:/www/www/php/lib/php') in /www/www/docs/6.4.1/neutrino/lib_ref/i/iscntrl.html on line 1
Warning: main(/www/www/htdocs/style/header.php) [function.main]: failed to open stream: No such file or directory in /www/www/docs/6.4.1/neutrino/lib_ref/i/iscntrl.html on line 8
Warning: main() [function.include]: Failed opening '/www/www/htdocs/style/header.php' for inclusion (include_path='.:/www/www/common:/www/www/php/lib/php') in /www/www/docs/6.4.1/neutrino/lib_ref/i/iscntrl.html on line 8
Test a character to see if it's a control character
#include <ctype.h>
int iscntrl( int c );
- c
- The character you want to test.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The iscntrl() function tests for any control character.
An ASCII control character is any character whose value is between 0 and 31.
Nonzero if c is a control character; otherwise, zero.
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
char the_chars[] = { 'A', 0x09, 'Z' };
#define SIZE sizeof( the_chars ) / sizeof( char )
int main( void )
{
int i;
for( i = 0; i < SIZE; i++ ) {
if( iscntrl( the_chars[i] ) ) {
printf( "Char %c is a Control character\n",
the_chars[i] );
} else {
printf( "Char %c is not a Control character\n",
the_chars[i] );
}
}
return EXIT_SUCCESS;
}
produces the output:
Char A is not a Control character
Char is a Control character
Char Z is not a Control character
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
Yes |
Signal handler |
Yes |
Thread |
Yes |
isalnum(),
isalpha(),
isdigit(),
isgraph(),
islower(),
isprint(),
ispunct(),
isspace(),
isupper(),
iswcntrl(),
isxdigit(),
tolower(),
toupper()
Warning: main(/www/www/htdocs/style/footer.php) [function.main]: failed to open stream: No such file or directory in /www/www/docs/6.4.1/neutrino/lib_ref/i/iscntrl.html on line 156
Warning: main() [function.include]: Failed opening '/www/www/htdocs/style/footer.php' for inclusion (include_path='.:/www/www/common:/www/www/php/lib/php') in /www/www/docs/6.4.1/neutrino/lib_ref/i/iscntrl.html on line 156