please try to solve this question i have exam next week. Why two buffer halves a
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Question
please try to solve this question i have exam next week.
Why two buffer halves are used in input buffering? b. Name the transformations needed to apply to convert a given grammar into an LL(1). c. State the structure of a LEX Program. Write one line for each section of a LEX program. d. Remove left recursion from the following Context-Free Grammar. S Aa|Sa|c A rightarrow > Ab | Sd | e Apply left factoring on the following Context-Free Grammar. e. Apply left factoring on the following Context-Free Grammar.Explanation / Answer
Ans.1.a)
In input buffering, whenever the forward pointer is moved, a check is done to ensure that one half of the buffer has not moved off. If it is done, then the other half must be reloaded. Therefore the ends of the buffer require two halves for each advance of the forward pointer.
b) Transformations needed to apply to convert a given grammar into LL(1):
1. Epsilon derivation removal
2. Left Recursion Elimination
3. Factorization
c) Structure of LEX program:
1. Definition Section: Defines macros and imports header files.
2. Rules Section: Associates regular expression patterns with statements.
3. Code section: Contains statements and functions.
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