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STDBOOL(3) Library Functions Manual STDBOOL(3) NAME stdbool - standard boolean types SYNOPSIS #include <stdbool.h> DESCRIPTION The <stdbool.h> header defines four macros: 1. bool, which expands to _Bool; 2. true, which expands to the integer constant 1; 3. false, which expands to the integer constant 0; and 4. __bool_true_false_are_defined, which expands to the constant 1. The ability to undefine and redefine the macros bool, true, and false is an obsolescent feature that may be withdrawn in a future version of a standard. SEE ALSO stdint(3) STANDARDS The <stdbool.h> header conforms to ISO/IEC 9899:1999 ("ISO C99") and IEEE Std 1003.1-2001 ("POSIX.1"). HISTORY The <stdbool.h> header was first introduced in NetBSD 1.6. NetBSD 8.0 March 21, 2010 NetBSD 8.0