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SUBRANGE.MOD
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1989-01-18
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(* Chapter 10 - Program 2 *)
MODULE Subrange;
TYPE Days = (mon,tue,wed,thu,fri,sat,sun);
Work = [mon..fri];
Rest = [sat..sun];
VAR Day : Days; (* This is any day of the week *)
Workday : Work; (* These are the working days *)
Weekend : Rest; (* The two weekend days only *)
Index : [1..12];
Index2 : INTEGER[1..12];
Alphabet : ['a'..'z'];
Start : ['a'..'e'];
BEGIN (* Main program *)
(* The following statements are commented out because they
contain various errors that will halt compilation.
Workday := sat; sat is not part of Workday's subrange.
Rest := fri; fri is not part of Rest's subrange.
Index := 13; Index is only allowed to go up to 12,
Index := -1; and down to 1.
Alphabet := 'A'; Alphabet, as defined, includes only the
lowercase alphabet.
Start := 'h'; h is not in the first five letters.
End of the commented out section of program.
*)
Workday := tue;
Weekend := sat;
Day := Workday;
Day := Weekend;
Index := 3 + 2 * 2;
Start := 'd';
Alphabet := Start;
(* Since Alphabet is 'd' *)
INC(Alphabet); (* and now 'e' *)
Start := Alphabet; (* Start will be 'e' *)
DEC(Start,2); (* Start will be 'c' *)
Day := wed;
INC(Day); (* Day will now be 'thu' *)
INC(Day); (* Day will now be 'fri' *)
Index := ORD(Day); (* Index will be 4 (fri = 4) *)
END Subrange.
(* Result of execution
(There is no output from this program)
*)