PowerD.html - SELECT definition

Syntax:
```
  SELECT <exp>
  CASE <exp1>             // multiple CASEs can occur
    <statements1>
  [ DEFAULT
    <statements> ]
  ENDSELECT [ <list> ]
```
<exp> is a source expression which will be compared with each of <exp1> expressions. <exp1> can contain multiple expressions. (See below.) If atleast one of them will be the same as result of <exp>, <statements1> will be processed. If no, next CASE will be tested. If no CASE matched the <exp>, <statements> (after DEFAULT) will be processed.
Multiple expressions:
Single expressions must be separated by a comma (,):
```
  CASE <a>,<b>; <statements>
```
If <exp> equals to <a> or <b>, <statements> will be processed.
Arrays in expressions:
<exp1> can contain also arrays, which are made with TO keyword:
```
  CASE <a> TO <b>; <statements>
```
where <a> is bottom and <b> is top of the array. If <exp> fits to the array <statements> will be processed.

Examples:

  SELECT age
  CASE 0 TO 17
    PrintF('Young\n')
  CASE 18 TO 50
    PrintF('Adult\n')
  CASE 51 TO 120
    PrintF('Old\n')
  DEFAULT
    PrintF('What???\n')
  ENDSELECT

  name:=SELECT Person.ID
    CASE 1 IS 'Paul'
    CASE 2 IS 'Jenny'
    CASE 3 IS 'Peter'
    CASE 4 IS 'Mark'
    ENDSELECT 'unknown'