I have a scoping question that deals with static and dynamic scoping. I need hel

Question

I have a scoping question that deals with static and dynamic scoping. I need help on 6 A. &B, please. Thanks!

useful 6. Gonsider the following JavaScript skeletal program: I/ The main program function sub1 function sub2 function Bub3 Assume that the execution of this program is in the following unit order: Bubl calls Bub2 Problem Set 237 a. Assuming static scoping, in the following, which dee- laration of x is the correct one for a reference to x? sub1 sub2 iii, sub3 Repeat assume namic scopin

Explanation / Answer

6. a)

Assuming static scoping sub1, sub2, and sub3 whether the variable x needs to be declared within the function or as a global variable.

What happens that in static scoping when a variable is used in a function it will look for the variable within the function and if the variable is not there it will directly check whether the variable is a global variable. If that variable is a global variable the program will execute otherwise produce an error.

b) In case of Dynamic Scoping if the variable is declared in the calling function means in the previous function then it will be utilized dynamically, so in this case suppose x is declared in main and main is calling sub1 then sub1 is calling sub2 and then sub2 is calling sub3 so in dynamic scoping while accessing variable x in sub3 if the variable is not there it will look in sub2 then sub1 and at last from main variable x will be accessed.

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