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Posted By: Nitin Bajaj - Editor Member Level: Diamond Posted Date: 24 Mar 2008
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2007 Jawaharlal Nehru Technological University B.Tech LANGUAGE PROCESSORS (Computer Science & Engineering) Question paper
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III B.Tech II Semester Supplimentary Examinations, Aug/Sep 2007 LANGUAGE PROCESSORS (Computer Science & Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
1. (a) Write a procedure for constructing a deterministic ?nite automata from a non-deterministic Automata, explain with one example. [10] (b) Give the general format of a LEX program. [6]
2. (a) Eliminate ambiguities in the following grammar. S ? iEtS|iEtSeS|a E ? b|c|d where a,b,c,d,e,i,t are trminals. (b) Construct operator precedence parse table for the above grammer. [8] [8]
3. (a) Explain in detail how an L-attributed grammer can be converted into a translator scheme. (b) Give the translate scheme to convert an expression grammer into three address code. [8+8]
4. (a) Write a note on the speci?cation of a Simple type checker. (b) Explain the equivalence of type expressions with appropriate examples. [8] [8]
5. (a) Which data structure will be used to implement a symbol table in an e?cient way? Give reasons. [8] (b) Discuss and analyze about all the allocation strategies in run-time storage environment . [8]
6. (a) What are the applications of DAG. Explain how the following expression can be converted in a DAG a+b*(a+b)+c+d [8] (b) Explain how loop invariant components can be eliminated. [8]
7. (a) Discuss the various forms of object code. [8] (b) Explain how the nature of the object code is highly dependent on the machine and the operating system. [8]
8. Develop program speci?cations for the passes of a two pass assembler indicating (a) (b) (c) (d) Tables for internal use of the passes. Tables to be shared between passes. Inputs ( Files and Tables ) for every pass. Outputs ( Files and Tables ) of every pass. ????? 1 of 1 [4] [4] [4] [4]
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