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Boolean type support library : <stdbool.h>
 
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);
}

Output:

0
1
1