Recent questions tagged left-recursion

+1 vote

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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.

asked Sep 6, 2019 in Compiler Design by Lakshman Patel RJIT Veteran (59.3k points) | 27 views

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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. $S\rightarrow 0S1\mid 01$ ... $bfactor\:\rightarrow\:not\:bfactor\mid (bexpr)\mid true\mid false$

asked Aug 20, 2019 in Compiler Design by Lakshman Patel RJIT Veteran (59.3k points) | 12 views

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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 $

asked Aug 20, 2019 in Compiler Design by Lakshman Patel RJIT Veteran (59.3k points) | 24 views

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0 answers

4

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?

asked Aug 20, 2019 in Compiler Design by Lakshman Patel RJIT Veteran (59.3k points) | 37 views

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0 answers

5

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

asked Mar 29, 2019 in Compiler Design by aditi19 Loyal (5.2k points) | 80 views

+1 vote

1 answer

6

Ace Test Series: Compiler Design - Left Recursion Elimination

asked Jan 23, 2019 in Compiler Design by Shankar Kakde (195 points) | 89 views

+1 vote

0 answers

7

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

asked Jan 2, 2019 in Compiler Design by susgir2 Active (1.5k points) | 96 views

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0 answers

8

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

asked Oct 26, 2018 in Compiler Design by aditi19 Loyal (5.2k points) | 81 views

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0 answers

9

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

asked Sep 19, 2018 in Compiler Design by Na462 Loyal (7k points) | 62 views

0 votes

1 answer

10

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

asked Jan 31, 2018 in Compiler Design by Mk Utkarsh Boss (36.6k points) | 243 views

+3 votes

0 answers

11

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.

asked Jan 23, 2018 in Compiler Design by nishitshah (187 points) | 243 views

+1 vote

2 answers

12

left recursion

asked Sep 17, 2017 in Theory of Computation by Parshu gate Active (3.1k points) | 213 views

+1 vote

0 answers

13

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

asked Aug 19, 2017 in Compiler Design by Vivek Jain Junior (787 points) | 159 views

+23 votes

6 answers

14

GATE2017-2-32
Consider the following expression grammar $G$: $E \rightarrow E-T \mid T$ $T \rightarrow T + F \mid F$ $F \rightarrow (E) \mid id$ Which of the following grammars is not left recursive, but is equivalent to $G$? $E \rightarrow E-T \mid T$ ... $F \rightarrow (E) \mid id$ $E \rightarrow TX \mid (TX)$ $X \rightarrow -TX \mid +TX \mid \epsilon$ $T \rightarrow id$

asked Feb 14, 2017 in Compiler Design by Arjun Veteran (431k points) | 3.2k views

+1 vote

1 answer

15

Remove Left recursion from context free grammer

asked Jan 31, 2017 in Compiler Design by rahuldb (275 points) | 578 views

+1 vote

2 answers

16

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

asked Jan 7, 2017 in Compiler Design by Anand. Active (2.3k points) | 882 views

+1 vote

1 answer

17

asked Nov 29, 2016 in Compiler Design by Anshul_S (11 points) | 120 views

+2 votes

3 answers

18

Remove Left Recursion from given grammar, if any?

asked Nov 14, 2016 in Compiler Design by smartmeet Active (4.9k points) | 824 views

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