Boolean type support library

< 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.

[edit] Macros

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

[edit] Example

#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:


[edit] See also