2. Consider the following program:procedure Main is X, Y, Z : Integer; procedure
ID: 3633080 • Letter: 2
Question
2. Consider the following program:procedure Main is
X, Y, Z : Integer;
procedure Sub1 is
A, Y, Z: Integer;
procedure Sub2 is
A, B, Z : Integer;
begin – of Sub2
…
end; -- of Sub2
begin – of Sub1…end;-- of Sub1
procedure Sub3 isA, X, W: Integer;
begin – of Sub3…end; -- of Sub3
begin – of Main…end. – of Main
List all the variables, along with the program units where they are declared, that are visible in the bodies of Sub1, Sub2, and Sub3, assuming static scoping is used. You may use a table as following:
Variable Where
DeclaredIn Sub1: var1 Main
var2 Main
…
In Sub2 …
Explanation / Answer
Unit
Var
Where Declared
sub1
a, y, x, z
sub1
main
sub2
a, b, z, x, y
sub2
main
sub3
a, x, w, y, z
sub3
main
Unit
Var
Where Declared
sub1
a, y, x, z
sub1
main
sub2
a, b, z, x, y
sub2
main
sub3
a, x, w, y, z
sub3
main
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