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stdbool.h

The stdbool.h header provides macros for the _Bool data type.

Macros

bool
Expands to _Bool
Macro for the built-in boolean data type.
true
Expands to 1
Macro for an integer representing boolean true.
false
Expands to 0
Macro for an integer representing boolean false.
__bool_true_false_are_defined
Expands to 1
Macro for an integer representing a boolean value which indicates whether the macros true and false are declares by the standard library implementation. Testing for the declaration of these macros is unnecessary when using the GNU Compiler Collection (GNU C Library) on x86 and x86-64 as they will always have been declared.

External links