madeeasy work book

Question

X-->Ya|f

Y-->bY|d

Z-->cZ|e

FOLLOW(Z)???

Comments

follow(Z) = { } = phi

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@joshi if z is starting symbol then it should be $ else its not reachable right?

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yes.

Answer 1

First of all Z is unreachable variable...that is .....no production is able to reach upto Z....

now follow of Z (which is in R.H.S) is follow is Z (which is in L.H.S)...

but there is no occurence of Z in any production in RHS side ...

so here follow of Z is { }....PHI......

(actually we never get follow of any variable as PHI...but as variable is UNREACHABLE...we say it as PHI...)

Comments

thnx