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CONCEPTS OF PROGRAMMING LANGUAGE Consider the following skeleton program skeleton. List all the variables, along with...

CONCEPTS OF PROGRAMMING LANGUAGE

Consider the following skeleton program skeleton. List all the variables, along with the program units where they are declared, that are visible in the bodies of Sub1, Sub2, and Sub 3, assuming static scoping is used.

Procedure Main is

X, Y, Z: Integer;

procedure Sub1 is

A, Y, Z: Integer;

begin -- of Sub1

...

end; -- of Sub1

procedure Sub2 is

A, X, W: Integer;

procedure Sub3 is

A, B, Z: Integer;

begin -- of Sub3

...

end; -- of Sub3

begin -- of Sub2

...

end; -- of Sub2

begin - of Main

...

end; -- of Main

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Answer #1

Answer

List of variables visible in sub1

A,Y,Z

Obtained from procedure Sub1

X,W

Obtained from procedure Main

List of variables visible in sub2

A,X,W

Obtained from procedure Sub2

Y,Z

Obtained from procedure Main

List of variables visible in sub3

A,B,Z

Obtained from procedure Sub3

X,W

Obtained from procedure Sub2

Y

Obtained from procedure Main

--

all the best

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