Boolean type support library

 

C

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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.

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