Question: question type TOC/Automata Languages 1 What does it mean that a CFG is ambiguous? Consider the following CFG: Op1 Op1 + Op2 | Op1 -

question type TOC/Automata Languages

1 What does it mean that a CFG is ambiguous? Consider the following CFG:

where the terminals are {(,),+,-,*,/,id} and Op1 is the starting symbol. This grammar defines well-bracketed mathematical expressions that have addition, subtraction, multiplication, and division as operations. For example,

( id + id ) / id - id * id

is a string that can be generated by the grammar. Is this grammar ambiguous? Justify your answer.

[10 marks]

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