===== Logic constants =====

The logic constants are the integer constants $ct[TRUE] and $ct[FALSE]. While the constant $ct[TRUE] has the value 1, in general any integer value different to 0 will serve as a truth value of //true// (see $lty[Boolean]).

^ Name ^ Value ^
| $lct[FALSE] | 0 |
| $lct[TRUE] | 1 |

$ct[TRUE] and $ct[FALSE] are special in that, unlike all other constants, neither of them can be prefixed by a minus sign in either the globals section or after a typecast, for example:

<code lsl2>
integer a = -TRUE; // Syntax error
integer b = -LINK_ROOT; // Valid

default
{
    state_entry()
    {
        integer c = (integer)-FALSE; // Syntax error
        integer d = (integer)-LINK_ROOT; // Valid
    }
}
</code>

==== See also ====

  * $lty[Boolean] values