Table of Contents
- 1 What is ambiguity how it is removed explain with example?
- 2 How do you convert an ambiguous grammar to unambiguous grammar?
- 3 Which is the correct statement regarding the ambiguous grammar?
- 4 How do you remove ambiguity in Java?
- 5 Which grammar is ambiguous?
- 6 Which of the following grammar is are ambiguous?
- 7 How to remove the ambiguity from grammar in Python?
- 8 Is it always possible to convert ambiguous grammar into unambiguous grammar?
What is ambiguity how it is removed explain with example?
A grammar is said to be ambiguous if there exists more than one leftmost derivation or more than one rightmost derivation or more than one parse tree for the given input string. No method can automatically detect and remove the ambiguity, but we can remove ambiguity by re-writing the whole grammar without ambiguity.
How do you convert an ambiguous grammar to unambiguous grammar?
To convert ambiguous grammar to unambiguous grammar, we will apply the following rules: 1. If the left associative operators (+, -, *, /) are used in the production rule, then apply left recursion in the production rule….Unambiguous grammar will be:
- S → AB.
- A → Aa | a.
- B → b.
What do you mean by ambiguity in grammar write an example?
A grammar is said to be ambiguous if there exists more than one left most derivation or more than one right most derivation or more than one parse tree for a given input string. If the grammar is not ambiguous then we call it unambiguous grammar. If the grammar has ambiguity then it is good for compiler construction.
How do you find the ambiguity of a grammar MCQ?
A given grammar is called ambiguous if
- two or more productions have the same non-terminal on the left-hand side.
- a derivation tree has more than one associated sentence.
- there is a sentence with more than one derivation tree corresponding to it.
- brackets are not present in the grammar.
Which is the correct statement regarding the ambiguous grammar?
Explanation: A context free grammar is ambiguous if it has more than one parse tree generated or more than one leftmost derivations. An unambiguous grammar is a context free grammar for which every valid string has a unique leftmost derivation. 2.
How do you remove ambiguity in Java?
If the grammar has ambiguity then it is not good for a compiler construction. No method can automatically detect and remove the ambiguity but you can remove ambiguity by re-writing the whole grammar without ambiguity.
How do I get rid of left recursion?
Left recursion is eliminated by converting the grammar into a right recursive grammar.
Is it possible for a regular grammar to be ambiguous?
To answer your comment: there exist ambiguous regular grammars, for instance S→A∣B,A→a,B→a has two leftmost derivations for a: S⇒A⇒a and S⇒B⇒a. An equivalent unambiguous grammar is S→a.
Which grammar is ambiguous?
In computer science, an ambiguous grammar is a context-free grammar for which there exists a string that can have more than one leftmost derivation or parse tree, while an unambiguous grammar is a context-free grammar for which every valid string has a unique leftmost derivation or parse tree.
Which of the following grammar is are ambiguous?
Following are some examples of ambiguous grammars: S-> aS |Sa| Є E-> E +E | E*E| id. A -> AA | (A) | a.
Which parser can parse ambiguous grammar?
LR parser can be used to parse ambiguous grammars. LR parser resolves the conflicts (shift/reduce or reduce/reduce) in parsing table of ambiguous grammars based on certain rules (precedence and/or associativity of operators) of the grammar.
What is the ambiguity problem?
What is Ambiguity? You are dealing with ambiguous situations when you see that there is more than one solution to a problem, but you aren’t sure which one to do. Or, it might be when you come to a conclusion about a situation, but before you can act on it, the situation has already changed.
How to remove the ambiguity from grammar in Python?
1 There exists no general algorithm to remove the ambiguity from grammar. 2 To check grammar ambiguity, we try finding a string that has more than one parse tree. 3 If any such string exists, then the grammar is ambiguous otherwise not.
Is it always possible to convert ambiguous grammar into unambiguous grammar?
It is not always possible to convert an ambiguous grammar into an unambiguous grammar. The ambiguity from the grammar may be removed using the following methods- An ambiguous grammar may be converted into an unambiguous grammar by implementing-
What are ambiguous grammars in JavaScript?
The grammars which have more than one derivation tree or parse tree are ambiguous grammars. These grammar is not parsed by any parsers. 1. Consider the production shown below – Say, we want to generate the string “abab” from the above grammar. We can observe that the given string can be derived using two parse trees.
Is language inherently ambiguous?
If every Context Free Grammar G with Language L = L (G) is ambiguous, then L is said to be inherently ambiguous Language. Ambiguity is a property of grammar not languages.