Doubt

Question

Multi-level access link (or display) arrangement is needed to arrange activation records only if the programming language being implemented has nesting of procedures/functions.

Please explain.

Answer 1

https://gateoverflow.in/1687/gate1998_2-15?show=94421#c94421

Comments

i read it before and it was not clear to me. Plz explain

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Each subroutines or sub functions always use activation records as they have lots of local variables  

now whenever there is code or block to be accessed from other function which is not in my function then access links are used

multi level access links or display arrangement is uses to replace these access links

they have an array of pointers to all these activation records and allows access of variables and records of a subroutine from another subroutine

so incase of nested function suppose there are 5 nested functions

then a display arrangement i.e an array of size 5 is maintained,one for each subroutine and can be accessed as per requirement

hope ur clear :)