Page 72 - C-Language

# ifndef true
# define true true
# endif
# ifndef false
# define false false
# endif
#else
# include <stdbool.h>
#endif

/* Somewhere later in the code ... */
bool b = true;

This allows compilers for historic versions of C to function, but remains forward compatible if the
code is compiled with a modern C compiler.

For more information on typedef, see Typedef, for more on enum see Enumerations

Read Boolean online: https://riptutorial.com/c/topic/3336/boolean

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