Description

The iscntrl() function tests for any control character or any character for which [isprint()|int isprint(int c)] is false.

The behavior of the iscntrl() function is affected by the current locale. To modify the behavior, change the LC_CTYPE category in setlocale() that is, setlocale(LC_CTYPE, newlocale). In the C locale or in a locale where character type information is not defined, characters are classified according to the rules of the U.S. ASCII 7-bit coded character set.

Parameters

• c Is an integer whose value is representable as an unsigned char or the value of the macro EOF.

Return Values

The iscntrl() function returns non-zero for true and zero for false. If the parameter is not in the domain of the function, the return result is undefined.