# Boolean type support library

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< c‎ | types

The C programming language, as of C99, supports Boolean arithmetic with the built-in type `_Bool` (see _Bool). When the header `<stdbool.h>` is included, the Boolean type is also accessible as `bool`.

Standard logical operators &&, ||, ! can be used with the Boolean type in any combination.

A program may undefine and perhaps then redefine the macros `bool`, `true` and `false`.

### Macros

Macro name | Expands to
`bool` | _Bool
`true` | integer constant `1`
`false` | integer constant `0`
`__bool_true_false_are_defined` | integer constant `1`

### Example

Run this code

    #include <stdio.h>
    #include <stdbool.h>

    int main(void)
    {
        bool a=true, b=false;
        printf("%d\n", a&&b);
        printf("%d\n", a||b);
        printf("%d\n", !b);
    }

Possible output:

    0
    1
    1

### See also

C++ documentation for bool

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