A boolean literal has a value of either: true or false.

The following are not valid boolean literals:

 

True     # WRONG: Not lowercase.

"true"   # WRONG: These are string literals, not

"false"  # boolean literals.

 

A boolean literal can be specified in any context in which a boolean value is required; for example:

 

response to BeginL

    while (true) loop

        begin

            response to Done

                    ...

                leave loop

        end

    end loop