GATE CS 2016 Set 1 — Question 56
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Compiler Design → Semantic Analysis → Syntax-Directed Translation
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Question
Consider the following Syntax Directed Translation Scheme (SDTS), with non-terminals and terminals .
Using the above SDTS, the output printed by a bottom-up parser, for the input aab is:
Using the above SDTS, the output printed by a bottom-up parser, for the input aab is:
Correct answer
(C) 2 3 1
Solution
A bottom-up parser performs reductions in the reverse order of a rightmost derivation. Let's find the rightmost derivation for the input string aab:The reductions occur in the following order:
1.The handle is reduced to using . Action: print 2.
2.The handle is reduced to using . Action: print 3.
3.The handle is reduced to using . Action: print 1.
Thus, the output sequence is 2 3 1.Continue learning with Success Tracker
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