`<stdbool.h>`

[Added with C99]

Include the standard header <stdbool.h> to define a type and several macros suitable for writing Boolean tests. The standard header <stdbool.h> is available even in a freestanding implementation.

    /* MACROS */
#define bool _Bool [keyword in C++]
#define false 0 [keyword in C++]
#define true 1 [keyword in C++]
#define __bool_true_false_are_defined 1

    /* TYPES */
typedef i-type bool; [keyword in C++]

`__bool_true_false_are_defined`

#define __bool_true_false_are_defined 1

The macro yields the decimal constant 1.

`bool`

#define bool _Bool [keyword in C++]

The macro yields the type _Bool.

`false`

#define false 0 [keyword in C++]

The macro yields the decimal constant 0.

`true`

#define true 1 [keyword in C++]

The macro yields the decimal constant 1.

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