stdbool.h

Facilities for boolean integral values.

This header file defines some convenient macros for manipulating boolean values. The table below lists these macros.

Table 1. Definitions in stdbool.h
Macro	Action
`bool`	Define variables of boolean type. Expands to the built-in boolean type, `Bool`.
`true`	Represent a logical true value. Expands to 1.
`false`	Represent a logical false value. Expands to 0.
`bool_true_false_are_defined`	Check for availability of `stdbool.h`facilities. When defined, expands to 1.

The facilities in this header file are only available when the compiler is configured to compile source code for C99 (ISO/IEC 9899:1999). Refer to the Build Tools Reference for information on compiling C99 source code.