The expression (a*b)* c op........ where 'op' is one of '+', '*' and '↑' (exponentiation) can be evaluated on a CPU with a single register without storing the value of (a * b) if

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• Consider the grammar with the following translation rules and E as the start symbol. E → E1 # T { E.value = E1.value * T.value } | T{ E.value = T.value } T → T1 & F { T.value = T1.value + F.value } | F{ T.value = F.value } F → num { F.value = num.value } Compute E.value for the root of the parse tree for the expression: 2 # 3 & 5 # 6 & 4.
• Which of the following statements are TRUE? I. There exist parsing algorithms for some programming languages whose complexities are less than O(n3). II. A programming language which allows recursion can be implemented with static storage allocation. III. No L-attributed definition can be evaluated in the framework of bottom-up parsing. IV. Code improving transformations can be performed at both source language and intermediate code level.
• Consider the following expression grammar. The seman-tic rules for expression calculation are stated next to each grammar production. E → number E.val = number. val | E '+' E E(1).val = E(2).val + E(3).val | E '×' E E(1).val = E(2).val × E(3).val The above grammar and the semantic rules are fed to a yacc tool (which is an LALR (1) parser generator) for parsing and evaluating arithmetic expressions. Which one of the following is true about the action of yacc for the given grammar?
• Match all items in Group 1 with correct options from those given in Group 2. List I List II P. Regular Expression 1. Syntax analysis Q. Push down automata 2. Code Generation R. Dataflow analysis 3. Lexical analysis S. Register allocation 4. Code optimization
• Consider the following expression u*v+a-b*c Which one of the following corresponds to a static single assignment from the above expressions
• Consider the following translation scheme. S → ER R → *E{print("*");}R | ε E→ F + E {print("+");} | F F → (S) | id {print(id.value);} Here id is a token that represents an integer and id.value represents the corresponding integer value. For an input '2 * 3 + 4', this translation scheme prints
• In multi-programmed systems, it is advantageous if some programs such as editors and compilers can be shared by several users. Which of the following must be true of multi-programmed systems in order that a single copy of a program can be shared by several users? I. The program is a macro II. The program is recursive III.The program is reentrant
• Let L={w \in (0 + 1)*|w has even number of 1s}, i.e. L is the set of all bit strings with even number of 1s. Which one of the regular expression below represents L?
• Which one of the following languages over the alphabet {0,1} is described by the regular expression: (0+1)*0(0+1)*0(0+1)*?
• In some programming languages, an identifier is permitted to be a letter followed by any number of letters or digits. If L and D denotes the set of letters and digit respectively. Which of the following expression defines an identifier?