1
GATE CSE 2015 Set 1
+1
-0.3
Which one of the following is TRUE at any valid state in shift-reduce parsing?
A
Viable prefixes appear only at the bottom of the stack and not inside
B
Viable prefixes appear only at the top of the stack and not inside
C
The stack contains only a set of viable prefixes
D
The stack never contains viable prefixes
2
GATE CSE 2015 Set 2
+1
-0.3
Match the following:
GROUP 1 GROUP 2
P. Lexical analysis 1. Graph coloring
Q. Parsing 2. DFA minimization
R. Register allocation 3. Post-order traversal
S. Expression evaluation 4. Production tree
A
$$P - 2,\,\,Q - 3,\,\,R - 1,\,\,S - 4$$
B
$$P - 2,\,\,Q - 1,\,\,R - 4,\,\,S - 3$$
C
$$P - 2,\,\,Q - 4,\,\,R - 1,\,\,S - 3$$
D
$$P - 2,\,\,Q - 3,\,\,R - 4,\,\,S - 1$$
3
GATE CSE 2015 Set 3
+1
-0.3
Among simple $$LR (SLR) ,$$ canonical $$LR,$$ and look-ahead $$LR$$ $$(LALR),$$ which of the following pairs identify the method that is very easy to implement and the method that is the most powerful , in that order?
A
$$SLR, LALR$$
B
Canonical $$LR,$$ $$LALR$$
C
$$SLR,$$ canonical $$LR$$
D
$$LALR,$$ canonical $$LR$$
4
GATE CSE 2014 Set 2
+1
-0.3

Consider the grammar defined by the following production rules, with two operators * and +

\eqalign{ & S \to T*P \cr & T \to U\,|\,T*U \cr & P \to Q + P\,|\,Q \cr & Q \to id \cr & U \to id \cr}

Which one of the following is TRUE?

A
+ is left associative, while * is right associative
B
+ is right associative, while * is left associative
C
Both + and * are right associative
D
Both + and * are left associative
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