Ambiguous Grammars - ByteLABS

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Ambiguity

if Expr 1 then if Expr 2 then Stmt 1 else Stmt 2

Rule Sentential Form

— Stmt

1 if Expr then Stmt

2 if Expr then if Expr then WithElse else Stmt

3 if Expr then if Expr then WithElse else S 2

5 if Expr then if Expr then S 1 else S 2

? if Expr then if E 2 then S 1 else S 2

? if E 1 then if E 2 then S 1 else S 2

some other production

This grammar has only one rightmost derivation for the example

COMP 412, Fall 2002 19

Comp 412 Fall 2005

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Ambiguity if Expr 1 then if Expr 2 then Stmt 1 else Stmt 2 Rule Sentential Form — Stmt 1 if Expr then Stmt 2 if Expr then if Expr then WithElse else Stmt 3 if Expr then if Expr then WithElse else S 2 5 if Expr then if Expr then S 1 else S 2 ? if Expr then if E 2 then S 1 else S 2 ? if E 1 then if E 2 then S 1 else S 2 some other production This grammar has only one rightmost derivation for the example COMP 412, Fall 2002 19 Comp 412 Fall 2005

Page 1 and 2: Ambiguous Grammars Definitions •
Page 3: Ambiguity Removing the ambiguity

Ambiguous Grammars - ByteLABS

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