HP 3000 Manuals

HP ALLBASE/BRW Reference Manual

List Operations 

List operations select from a list of values.

A calculated item, for example, which translates the weekday number into
a three-character string, could be specified using nested IF THEN ELSE
constructions, like this:

           IF weekday = 1 THEN  "MON"
           ELSE  IF weekday = 2 THEN  "TUE"
             ELSE  IF weekday = 3 THEN  "WED"
               ELSE  IF weekday = 4 THEN  "THU"
                 ELSE  IF weekday = 5 THEN  "FRI"
                   ELSE  IF weekday = 6 THEN  "SAT"
                     ELSE  "SUN"

However, a more efficient method is to select from a list of values, as
shown here:

          weekday OF
          ("MON", "TUE", "WED", "THU", "FRI", "SAT", "SUN")

where weekday is the index, "MON" is 1..., and "SUN" is 7.  Each item in
the list must be of the same type and separated by commas.


NOTE  If the index points outside of the list, the resulting value of the
      list selection will be an index violation (see "Exception Values"
      in this chapter).


Related Sections 

   *   IF THEN ELSE
[REV BEG] 

MPE/iX 5.0 Documentation