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Question

Comments

D is correct!

as E'.y=E.x this shows that y is dependent on parent E attribute x

E.x=E'y this shows that x is dependent on its child E' attribute y

E2'y=E1'.y+T.x this shows that y attribute of E2 depends on Parent E1 attribute y and on Sibling T attribute x

E1'.x= E2'.x this shows that attribute x of E1 depends on it child E2 attribute x

Thus by definition of synthesized attributes and inherited attributes

Y is inherited and X is synthesized

Answer 1

For the first production x,y are attributes, Such that, x ∈  E and y∈ E'.

Now if you look into the translation closely, E'.y =E.x   ( y attribute is taking value from its parent attribute )

E.x =E'.y (x attribute is taking value from one of its child attributes).

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For the second production same story goes on and in addition, y is taking values from its parent as well as sibling which left to it (it is L- attributed as well).

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So, y follows inherited attribute definition while x follows synthesized attribute definition.

 

Read more attribute grammar

Comments

Thanks

Answer 2

When the parent takes value from its child it is known as a synthesized variable.

When Child takes value from its parents or its left siblings it is called inherited variable.

Comments

can you please elaborate your answer?