Enumerated types

Enumerated types allow a certain expression which can make your code easier to read.

An enumerated type consists of a list of values.  These values are not strings and they don't take storage, rather they are like a set of constants to which the language automatically assigns a value.

Here is an example.  Note that the names of the days are not surrounded by quotes (they are not strings)

type
   Tdays = (Monday,Tuesday,Wednesday,Thursday,Friday);

You now have a bunch of rather unconventional constants which can be used in expressions

type
   Tdays = (Monday,Tuesday,Wednesday,Thursday,Friday);
var
   days : Tdays;
begin
    for days := Monday to Thursday do
      begin
        writeln(ord(days));
      end;
      if ord(Thursday) = 3 then
        writeln('true')
      else
        writeln('false');
      readln;
end.

Notice that in order to actually use the values you'll need to convert the types by using the ord() function.

---

Logical (Bitwise) operators

Logical operators