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SUBRANGE.PAS
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Pascal/Delphi Source File
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1989-06-30
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1KB
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44 lines
PROGRAM scaler_operations;
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 the working days *)
weekend : rest; (* The two weekend days only *)
index : 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 weekend'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
lower case alphabet.
start := 'h' h is not in the first five letters.
End of commented out section. *)
workday := tue;
weekend := sat;
day := workday;
day := weekend;
index := 3+2*2;
start := 'd';
alphabet := start;
(* since alphabet is "d" *)
start := succ(alphabet); (* start will be 'e' *)
start := pred(alphabet); (* start will be 'c' *)
day := wed;
day := succ(day); (* day will now be 'thu' *)
day := succ(day); (* day will now be 'fri' *)
index := ord(day); (* index will be 4 (fri = 4) *)
END. (* of main program *)