# Boolean values

The mode `BOOL` is named after George Boole, the distinguished nineteenth century mathematician who developed the system of logic which bears his name. There are only two values of mode `BOOL`, and their denotations are `TRUE` and `FALSE`. Let us declare two identifiers:

       BOOL t = TRUE,
            f = FALSE

The `print` phrase, when fed with Boolean values prints `T` for `TRUE`, and `F` for `FALSE`, with spaces neither before nor after. Thus

       print((t,f,t,f,t))

produces `TFTFT` on the screen.