Case
    ----------------------
    Basic keyword
     
     
    Use: CASE allows you select what to do if a variable has
    one of a number of possible values.
     
    Example:
    Case day% Of
    When 0
    day$="Sunday"
    When 1
    day$="Monday"
    When 2
    day$="Tuesday"
    When 3
    day$="Wednesday"
    When 4
    day$="Thursday"
    When 5
    day$="Friday"
    When 6
    day$="Saturday"
    OtherWise
    day$="Invalid day"
    EndCase
     
    Note: Unlike BBC BASIC, the action for each When
    must start on a new line.