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.
Sian Mountbatten 2012-01-19