Recent questions tagged left-recursion

Recent questions tagged left-recursion

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To get follow of grammar ,Should I remove left_recursion first?
S-> SS | Aa A->Sb | a (a) prove that the grammar is ambiguous. (b) find the follow for the grammar (c) then remove the left recursion from the grammar.

Sara Wageh asked in Compiler Design Dec 31, 2021

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3 votes

1 answer

2

S->AA/ab A->Bd/null B->SB/d remove left recursion
S->AA/ab A->Bd/null B->SB/d remove left recursion

vrajdobariya asked in Compiler Design Sep 6, 2021

by vrajdobariya

280 views

1 vote

1 answer

3

Ullman (Compiler Design) Edition 2 Exercise 5.4 Question 3 (Page No. 337)
The following SDT computes the value of a string of $0's$ and $1's$ ... SDT so the underlying grammar is not left recursive, and yet the same value of $B.val$ is computed for the entire input string.

Lakshman Patel RJIT asked in Compiler Design Sep 6, 2019

by Lakshman Patel RJIT

859 views

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4

Ullman (Compiler Design) Edition 2 Exercise 4.4 Question 1 (Page No. 231)
For each of the following grammars, devise predictive parsers and show the parsing tables. You may left-factor and/or eliminate left-recursion from your grammars first. $S\rightarrow 0S1\mid 01$ ... $bfactor\:\rightarrow\:not\:bfactor\mid (bexpr)\mid true\mid false$

Lakshman Patel RJIT asked in Compiler Design Aug 20, 2019

by Lakshman Patel RJIT

832 views

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5

Ullman (Compiler Design) Edition 2 Exercise 4.3 Question 2 (Page No. 216 - 217)
Repeat Exercise 4.3.1 on the following grammars: $S\rightarrow SS+\mid SS\: \ast\mid a$ $S\rightarrow 0S1\mid 01$ $S\rightarrow S ( S ) S\mid \epsilon$ $S\rightarrow (L)\mid a$ ... $bterm\rightarrow bterm\:and\:bfactor\mid bfactor$ $bfactor\rightarrow not\: bfactor\mid ( bexpr )\mid true \mid false $

Lakshman Patel RJIT asked in Compiler Design Aug 20, 2019

by Lakshman Patel RJIT

334 views

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Ullman (Compiler Design) Edition 2 Exercise 4.3 Question 1 (Page No. 216)
The following is a grammar for regular expressions over symbols $a$ and $b$ only, using $+$ in place of $\mid$ for union, to avoid conflict with the use of vertical bar as a metasymbol in ... to left factoring, eliminate left recursion from the original grammar. Is the resulting grammar suitable for top-down parsing?

Lakshman Patel RJIT asked in Compiler Design Aug 20, 2019

by Lakshman Patel RJIT

726 views

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Ullman(2e) Exercise-5.4.2 page no-336 Syntax Directed Translation
Rewrite the following SDT: A->A {a} B | AB {b} | 0 B->B {c} A | BA {d} | 1 so that the underlying grammar becomes non-left-recursive. Here a, b, c and d are actions, and 0 and 1 are terminals is my solution correct? A→ 0A’ A’→ {a} BA’ | B {b} A’ | ε B→ 1B’ B’→ {c} AB’ | A {d} B’ | ε

aditi19 asked in Compiler Design Mar 29, 2019

644 views

1 vote

1 answer

8

Ace Test Series: Compiler Design - Left Recursion Elimination

Shankar Kakde asked in Compiler Design Jan 23, 2019

by Shankar Kakde

911 views

0 votes

1 answer

9

UPPCL AE 2018:64
The following grammar $\text{G}$ is left recursive. $\text{E} \rightarrow \text{E + T}\; \mid \; \text{T} $ $\text{T} \rightarrow \text{T * F} \; \mid \; \text{F} $ $\text{F} \rightarrow \text{(E)} \mid \textbf{id} $ Which of the following is a correct left- ...

Lakshman Patel RJIT asked in Compiler Design Jan 5, 2019

by Lakshman Patel RJIT

153 views

1 vote

0 answers

10

Non-Left recursive grammar of the below grammar.
Grammar. S → Aa | B A → Ac | Aad | bd | epsilon . .

susgir2 asked in Compiler Design Jan 2, 2019

355 views

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11

https://gateoverflow.in/1697/gate1998-6b
why isn't A replaced in the first production? that is also indirect recursive

aditi19 asked in Compiler Design Oct 26, 2018

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12

Left Recursion
Remove the Left Recursion from it : A -> B|a|CBD B -> C|b C -> A|c D -> d

Na462 asked in Compiler Design Sep 19, 2018

by Na462

226 views

0 votes

1 answer

13

Left Recursion Removal
Remove Left Recursion from the following Context Free Grammar. $S \rightarrow Aa| Sa|c$ $A \rightarrow Ab|Sd|e$

Mk Utkarsh asked in Compiler Design Jan 31, 2018

827 views

3 votes

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14

MadeEasy Test Series 2018: Compiler Design - Left Recursion
I think the answer should be option: C but it is given option A. Providing the snapshot of the question with the options provided. I don't think option A should be the correct one, even if it then we cannot derive ... "bda" from option A which is possible in the original grammar. Please help with this question. Thanks in advance.

nishitshah asked in Compiler Design Jan 23, 2018

709 views

1 vote

2 answers

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Parshu gate asked in Theory of Computation Sep 17, 2017

890 views

2 votes

0 answers

16

SELF DOUBT
Can we find FIRST and FOLLOW for a left recursive grammar?

Vivek Jain asked in Compiler Design Aug 19, 2017

549 views

1 vote

1 answer

17

Remove Left recursion from context free grammer

rahuldb asked in Compiler Design Jan 31, 2017

1.3k views

1 vote

2 answers

18

Remove Left recursion
Eliminate the left recursion of the grammar $S\rightarrow Bb / a$ $B\rightarrow Bc /Sd /e$

Anand. asked in Compiler Design Jan 7, 2017

by Anand.

1.8k views

1 vote

1 answer

19

Made Easy Test Series-2016
Ex. Consider the following grammar G. A → A + B|B B → int|(A) Which of the following grammar is equivalent to the above grammar G? a. A -> int + B | B B -> int | (A) | epsilon b. A -> BA' A' -> BA' | epsilon B -> int | (+A) c. ... | (A) but the answer given is C so can anybody please tell me how A' -> (A + B)A' | epsilon becomes A' -> +BA' | epsilon ?

Anshul_S asked in Compiler Design Nov 29, 2016

394 views

2 votes

4 answers

20

Remove Left Recursion from given grammar, if any?

smartmeet asked in Compiler Design Nov 14, 2016

1.5k views

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