else                     Optional Clause in an IF/THEN or CASE Statement

 if <bool exp> then            { IF/THEN }
   <statement>
 else
   <statement>;

 case <exp> of                 { CASE }
   <clist> : <statement>;
   ...
   <clist> : <statement>
   else      <statement>
 end;

    In an IF/THEN/ELSE statement, the ELSE statement is executed if <bool
    exp> is FALSE. In a CASE statement, the ELSE statement is executed if
    <exp> doesn't match any of the <clist> values. If you want ELSE to
    have more than one statement, you must use a compound statement, as
    shown below:

         else begin
           <statement>;
           <statement>;
           ...;
           <statement>
         end;

    In both IF/THEN and CASE statements, the ELSE statement is optional.

         <bool exp>   Any Boolean expression.

        <statement>   Any legal statement, including a compound statement.

              <exp>   Any ordinal expression.

            <clist>   Any list of ordinal values.