HP 3000 Manuals

HP C/iX Library Reference Manual

iscntrl 

Tests whether an argument is a control character.

Syntax 

     #include <ctype.h>
     int iscntrl (int c);

Parameters 

c             An argument to be evaluated.  The argument must be
              representable as an unsigned char or the macro EOF.

Return Values 

!=0           The argument passed in c is an ASCII control character.

0             The argument passed in c is not an ASCII control character.

Description 

The iscntrl function returns a nonzero value if the argument passed in c 
is an ASCII control character (octal values 00 through 037 and 0177);
otherwise, the returned value is zero.

See Also 

isalnum(), isalpha(), isdigit(), isgraph(), islower(), isprint(),
ispunct(), isspace(), isupper(), isxdigit(), ANSI C 4.3.1.3, POSIX.1 8.1

MPE/iX 5.0 Documentation