By Arnold Businger
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In this case the identifier on the left hand side is defined to be a new data type. It is not identical to the data type on the right hand side, a l t h o u g h both have the same internal structure. e. v a r i a b l e s of these types cannot be assigned to each other. 1 *) In this example C O M P L E X is introduced as a new data type and used for the d e c l a r a t i o n of the variable X. The variable Y is directly defined as a record. A l t h o u g h X and Y have the same structure, they are not of the same type and therefore cannot be assigned to each other.
Examples (see a l s o >= S2 I I + c) 3 in D I G I T S E T ( . ) 5 not in D ~ G I T S E T ( I . ) SET(1,3,5,7) (* (* (* (* (* = = = = = T R U E *) F A L S E *) T R U E *) T R U E *) F A L S E *) c) Set operations For s e t I types the following operations are d e f i n e d operator meaning not c o m p l e m e n t : The s e t " n o t S" contains ai1 values of the basic range type which are not members o f S. + set u n i o n . . . . . . . . . . . . . . . . . . . . . .
In P O R T A L the f o l l o w i n g four classes are d i s t i n g u i s h e d i) Negation (highest priority): not 2) Multiplication * 3) / Addition + 4) = priority): priority): xor operators (lowest < > for e v a l u a t i n g priority): <= expressions >= in can now be f o r m u l a t e d If two c o n s e c u t i v e o p e r a t o r s are of the same priority, on the left is e x e c u t e d first (B is added <=> to A, then C is added (The result <=> as follows the o p e r a t o r (A + B) + C to the result If two c o n s e c u t i v e o p e r a t o r s are of d i f f e r e n t with the h i g h e r p r i o r i t y is e x e c u t e d first A + B * C -- highest and (third h i g h e s t or A + B + C -- (second rem operators <> The rules -- div - Relation operators A+B) priorities, A + (B * C) of the m u l t i p l i c a t i o n B*C is added to A) The p r o g r a m m e r can influence the order of the e v a l u a t i o n of (round) p a r e n t h e s e s : An e x p r e s s i o n w i t h i n p a r e n t h e s e s ated before c o m b i n i n g it with a n o t h e r operand (A + B) (A is added by the use is e v a l u - * C to B, and the result m u l t i p l i e d The ( s u b - ) e x p r e s s i o n cording to the rules in p a r e n t h e s e s above.