Ambiguous grammar in toc

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 has ambiguity then it is good for compiler construction. ...

What is ambiguous CFG explain with example?
Why is ambiguous grammar used?
Which of the following grammar is ambiguous Mcq?
How do you write ambiguous grammar?
How do you correct ambiguity?
Which of the following grammar is ambiguous?
Is there an ambiguous regular grammar?
What is derivation tree in TOC?
Can ambiguous grammar be LR K?
Why is ambiguous grammar bad?
Are given grammar is called ambiguous if?
Which of the following is true for ambiguous grammar?
Is ambiguous grammar context free?

What is ambiguous CFG explain with example?

A CFG is ambiguous if one or more terminal strings have multiple leftmost derivations from the start symbol. Equivalently: multiple rightmost derivations, or multiple parse trees. ... The language of our example grammar is not inherently ambiguous, even though the grammar is ambiguous.

Why is ambiguous grammar used?

Grammars are used in compiler construction. Ambiguous grammars are undesirable because the derivation tree provides considerable information about the semantics of a program; conflicting derivation trees provide conflicting information.

Which of the following grammar is ambiguous Mcq?

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.

How do you write ambiguous grammar?

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. If the grammar is not ambiguous, then it is called unambiguous. If the grammar has ambiguity, then it is not good for compiler construction.

How do you correct ambiguity?

Alternation of Context: In clear writing, the context restricts meaning of words and structures. Therefore, ambiguity can be remedied by making the context sufficiently restrictive. Include specific details to narrow the possible meanings of the ambiguous statement.

Which of the following grammar is ambiguous?

Definition: G = (V,T,P,S) is a CFG is said to be ambiguous if and only if there exist a string in T* that has more than one parse tree. ... Following are some examples of ambiguous grammars: S-> aS |Sa| Є E-> E +E | E*E| id.

Is there an ambiguous regular grammar?

if a grammar is regular then it will be Context free also [as per chomsky hierarchy] it may be or may be not ambiguous depending on grammar. But it is sure any ambiguous regular grammar can be converted into unambiguous regular grammar.

What is derivation tree in TOC?

Derivation tree is a graphical representation for the derivation of the given production rules of the context free grammar (CFG). It is a way to show how the derivation can be done to obtain some string from a given set of production rules. It is also called as the Parse tree.

Can ambiguous grammar be LR K?

An ambiguous grammar can never be LR(k) for any k, because LR(k) algorithm aren't designed to handle ambiguous grammars. It would get stuck into undecidability problem, if employed upon an ambiguous grammar, no matter how large the constant k is.

Why is ambiguous grammar bad?

Ambiguous grammars are bad because they can lead to multiple ASTs for the same string, which by logic entails conflicting semantic definitions of elements of the language. Under this grammar, the expression “5 * 3 + 2” has two parses.

Are given grammar is called ambiguous if?

A given grammar is called ambiguous if

Concept: A grammar is said to be ambiguous if it can produce more than one parse tree for a string or when two different sequences of leftmost (or rightmost) derivations can produce the same string from the same start symbol.

Which of the following is true for ambiguous grammar?

Is ambiguous grammar context free?

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.