State whether or not each of the following language construc

State whether or not each of the following language constructs is syntactically valid. For each invalid construct, give the number of the syntax rule that is violated.

(a) Declaration: CONST mask = BITSET(9.. 11): divisor-512; (b) Declaration: PROCEDURE LessThan (addrl, addr2: ADDRESS): BOOLEAN; VAR rl, r2: POINTER TO REAL; BEGIN rl :- addrl; r2 :- addr2; RETURN r1A

Solution

a) invalid

syntax: bitset (unsigned long val); valid expression.

b) invalid

syntax: return (expression) return r1< r2 is valid.

c) valid