Compiler Design SDT

Question

Is it Possible that any SDT can be L-attributed and S-attributed both in the same question?

Comments

If a SDT is S-attributed, it definitely is L-attributed but the reverse is not true

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But if options are:-

a) S-attributed

b) L-attributed

c) Both.

d) None

then which is the right answer?

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If there are only synthesized attributes, answer will be both. If there are both synthesized and inherited attribs, ans would be L-attrib. Else, none

Answer 1

S-attribute : it uses synthsized attribute .

L-attribure ; it uses both synthesized attributes as well as inherited attributes.

in this example it is S-attribute as well as L-attribure hence option c is true.

Answer 2

You can see the Venn diagram 

If SDT is S-attributed, it is definitely L-attributed but if it is L attributed then it may or may not be S attributed 

Answer 3

yes , it is possible that any sdt can have both L-attributed and S-attributed.

since L-attributed sdt uses only synthesized attributes but L-attributed sdt uses both synthesized and inherited both.