Relational Operators

   Operator  Operation      Result type Operand types
   =       Equal            Boolean     compatible simple, pointer, set, string,
                                        or packed string types
   <>      Not equal        Boolean     compatible simple, pointer, set, string,
                                        or packed string types
   <       Less than        Boolean     compatible simple, string, packed string
                                        types, or PChar
   >       Greater than     Boolean     compatible simple, string, packed string
                                        types, or PChar
   <=      Less or equal    Boolean     compatible simple, string, packed string
                                        types, or PChar
   >=      Greater or equal Boolean     compatible simple, string, or packed
                                        string types, or PChar
   <=      Subset of        Boolean     compatible set types
   >=      Superset of      Boolean     compatible set types
   in      Member of        Boolean     left operand: any ordinal type T;
                                        right operand: set  whose base is
                                        compatible with T.