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Compiler Design Gate Question Bank-1 � AcademyEra
SDT provides a simple way to attach semantics to any such syntax. People also ask, what is synthesized and inherited attribute? The attribute which takes data values from its child nodes, is called synthesized attribute.� A parser is a compiler or interpreter component that breaks data into smaller elements for easy translation into another language. A parser takes input in the form of a sequence of tokens or program instructions and usually builds a data structure in the form of a parse tree or an abstract syntax tree. Compiler Design - Semantic Analysis - We have learnt how a parser constructs parse trees in the syntax analysis phase. The plain parse-tree constructed in that phase is generally of no use for a com.� If an SDT uses only synthesized attributes, it is called as S-attributed SDT. These attributes are evaluated using S-attributed SDTs that have their semantic actions written after the production (right hand side). As depicted above, attributes in S-attributed SDTs are evaluated in bottom-up parsing, as the values of the parent nodes depend upon the values of the child nodes. L-attributed SDT. This form of SDT uses both synthesized and inherited attributes with restriction of not taking values from right siblings. In L-attributed SDTs, a non-terminal can get values from its parent, child, and s. Questions related to Compiler Design. Udaysimha Nerella. asked a question related to Compiler Design. How to get multiple parse trees using NLTK or Stanford Dependency Parser? Question.� From the lessons I had in compiler design course, I could come up with a grammar for my text input and even a semantic rules to generate the SQL instruction. I thought I will go with Python for actual implementation and I came to know about NLTK libraries to implement a parser to parse my input. It works.� These tools were useful for our research group in the last three years and I thought it can also can help other people. The tools are available through direct download from sourceforge "dot" net or subversion checkout. Please, if found a bug let me know.

Choose the False statement. D None is LR k. The technique of replacing run time computation by compile time computation is called A constant folding. B code hoisting C peep hole optimization. D invariant computation Question 5 Explanation: The Correct Answer Among All the Options is A Expressions with constant operands can be evaluated at compile time, thus improving run-time performance and reducing code size by avoiding evaluation at compile-time.

Consider the following statements: I. Every grammar that is both left and right recursive for a non terminal is unambiguous. Recursive descent parsing can use left recursive grammars. Question 15 Consider the following grammar:.

Question 16 A grammar that has not any epsilon productions and also free from unit productions. Which of the following type of error earliest phase is identified during compilation of the program? Which of the following grammar is equivalent to the given grammar after eliminating the left recursion? The minimum number of nodes and edges present in the DAG representation of the above basic block respectively are. Question 21 Consider the following statements. Note also that the analyzer outputs the token that matches the longest possible prefix.

If the string bbaacabc is processes by the analyzer, which one of the following is the sequence of tokens it outputs? Consider a program P following the above grammar containing ten if terminals. If the above SDT count the number of balanced parenthesis, then select the correct value of P1 and P2 from options.

Question 27 Consider the following translation scheme. Here id is a token that represents an integer and id.

What will be the output of the following expression? Question 29 Consider the intermediate code given below:. Question 32 Consider the following translation scheme. Question 34 Consider the intermediate code given below:. Where S and X are non-terminals and a, b are terminals. Which of the following can be the viable prefixes?

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Compiler Design Gate Question Bank 1. Please wait while the activity loads. If this activity does not load, try refreshing your browser. Also, this page requires javascript. Please visit using a browser with javascript enabled. If loading fails, click here to try again. Question 1. Question 1 Explanation:. Question 2. The class of grammars that can be parsed using LR methods is proper subset of the class of grammar that can be parsed by LL method.

LR parsing is non-backtracking method. LR parsing can describe more languages than LL parsing. Question 2 Explanation:. Question 3. L1 is LR k. L2 is LR k. Both L1 and L2 is LR k. None is LR k.

Question 3 Explanation:. Question 4. Question 4 Explanation:. Question 5. The technique of replacing run time computation by compile time computation is called. Question 5 Explanation:. The Correct Answer Among All the Options is A Expressions with constant operands can be evaluated at compile time, thus improving run-time performance and reducing code size by avoiding evaluation at compile-time.

Question 6. Consider the following program segment: The number of tokens in above C code Question 6 Explanation:. Question 7. Consider the grammar defined by the following production rules: Which of the following is true? Question 7 Explanation:. Question 8. Question 8 Explanation:. Question 9.

Question 9 Explanation:. Question Question 10 Explanation:. Choose the correct option: A. The given grammar is CLR 1 grammar C. The given grammar is LL 1 D. The given grammar is ambiguous grammar. Question 11 Explanation:. D None of these. Question 12 Explanation:. Question 13 Explanation:. Consider the below given statements: S1: If G is an unambiguous grammar then every right sentential form has a unique handle. Select the correct option: A Both S1 and S2 are right.

B Both S1 and S2 are wrong. C S1 is right while S2 is wrong. D S1 is wrong while S2 is right. Question 14 Explanation:. Consider the following grammar: Which of the following can be the correct handle in bottom up parsing for the given grammar? Question 15 Explanation:. A grammar that has not any epsilon productions and also free from unit productions. Question Sdt Questions In Compiler Design 10 16 Explanation:.

Consider the following C program Which of the following type of error earliest phase is identified during compilation of the program? Question 17 Explanation:. Question 18 Explanation:. Consider the following grammar: Which of the following grammar is equivalent to the given grammar after eliminating the left recursion? Question 19 Explanation:. Consider the basic block given below: The minimum number of nodes and edges present in the DAG representation of the above basic block respectively are A 9 and 12 B 6 and 6 C 8 and 10 D 4 and 4.

Question 20 Explanation:. Select the correct option. A Both S1 and S2 are true. B S1 is true and S2 is false. C S1 is false and S2 is true. D Both S1 and S2 are false.

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