stdbool.h - boolean type and values
The <stdbool.h> header shall define the following macros:
bool Expands to _Bool.
true Expands to the integer constant 1.
false Expands to the integer constant 0.
Expands to the integer constant 1.
An application may undefine and then possibly redefine the macros bool,
true, and false.
The following sections are informative.
The ability to undefine and redefine the macros bool, true, and false
is an obsolescent feature and may be withdrawn in a future version.
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .