program t64_arrays;

{ t64 -- array TYPES and array typed constants: the 2-D sheet and XPOS.
  CALC.PAS:133 and :137:

      Cells = array['A'..'G',1..FYMax] of CellRec;   (FYMax = 21)
      XPOS  : array['A'..'G'] of Integer = (3,14,25,36,47,58,68);

  Ranges are row-major with the LAST varying fastest, and both ranges are
  stored in an ArrRec the symbol points at, so the shape survives for
  indexing.  `Sheet' is 7 * 21 * 80 = 11760 bytes; `XPOS' is 7 * 2 = 14.

  An array TYPED CONSTANT cannot fold to a word, so - like a set - its bytes
  are emitted in the code stream behind a JMP and the name becomes an
  addressable value; each element is written little-endian in the element's
  bytes.  So XPOS does NOT appear in the data area: data=11764 is Sheet
  (11760) + the two @@T temporaries, and XPOS's 14 bytes are in the code
  stream (code=67).  That is the storage decision showing up in the numbers.

  Array ELEMENT ACCESS (`Sheet[fx,fy]', `XPOS['C']') is the next increment: an
  element's width is not the array's, so a subscript is a LOUD error today
  rather than a store of the whole array. }

type
   Attributes = (Constant, Formula, Txt, OverWritten, Locked, Calculated);
   CellRec = record
      CellStatus : set of Attributes;
      Contents   : String[70];
      Value      : Real;
      DEC, FW    : 0..20;
   end;
   Cells = array ['A'..'G', 1..21] of CellRec;
const
   XPOS : array ['A'..'G'] of Integer = (3, 14, 25, 36, 47, 58, 68);
var
   Sheet : Cells;
begin
   writeln ('arrays declared')
end.