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LETTERiscntrlULETTER Tests for control characters.

Overview
#include <ctype.h>

b = iscntrl(ch);

int ch;

Portability
ANSI

Description
This function tests if the passed character is a control code. Under AmigaOS this includes all ASCII characters up to 32 and between 128 and 160.

Returns
0 if the character is no control character, otherwise a value <>0.

See also