4. (5 points) Is the following grammar ambiguous? Justify your answer (give a string and derive...

Question

Question

4. (5 points) Is the following grammar ambiguous? Justify your answer (give a string and derive it with two leftmost derivati

Answer 1

Answer #1

This grammar is ambiguous

take 001 string

a)S->0S

S->00S1S (S->0S1S)

S->001 (S->epsilon)

b)S->0S1S

S->00S1S (S->0S)

S->001 (S->epsilon)

we have two leftmost derivations therefore grammar is ambiguous.

we convert ambiguous grammar to unambiguous grammar by hit and trail method ..there are no derivations for that.

S->0S | TS | ^ (^==EPSILON)

T->0T1 | ^

we take any string we will get only one parse tree.just replacing the 0S1 with another variable T.

if u understand like else post a comment.

Answer 2

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