Boolean values have either the value true or false.  If a value is not true, it must be false and vice versa.  The not operator can be placed before a Boolean value to invert it.  In other words, not true is equal to false.

    > x = true

    > print(x)

    true

    > print(not x)

    false

    > print(not false)

    true

Boolean values are used to represent the results of logic tests.  The equals, ==, and not equals, ~=, operators return Boolean values depending on the values supplied to them.

    > print(5 == 6) // test whether two numbers are equal

    false

 

    x = 7.75;

    if (x == 5) then

   print("The value of x is:",x)

    else

   print("The value of x is:",x)

    end

    > The value of x is:    7.75

 

    > print(3 ~= 7) // test whether two numbers are not equal

    true

 

    > print(true ~= false) // is true not equal to false?

    true

1 and 0 equate to true and false, respectively.

 > print(1 == true)

 true

 > print(1 == false)

 false

Other numbers are not equated to either true or false.

> print(2 == true)

false

> print(2 == false)

false