CONCEPTS OF PROGRAMMING LANGUAGE Consider the following program skeleton Procedure Main is X, Y, Z: Integer;...
CONCEPTS OF PROGRAMMING LANGUAGE
Consider the following program skeleton
Procedure Main is
X, Y, Z: Integer;
procedure Sub1 is
A, Y, Z: Integer;
begin -- of Sub1
...
end; -- of Sub1
procedure Sub2 is
A, B, Z: Integer;
begin -- of Sub2
...
end; -- of Sub2
procedure Sub3 is
A, X, W: Integer;
begin -- of Sub3
...
end; -- of Sub3
begin - of Main
...
end; -- of Main
Given the following calling sequences and assuming that dynamic scoping is used, what variables are visible during execution of the last subprogram activated? Include with each visible variable the name of the unit where it is declared.
(a) Main calls Sub1; Sub1 calls Sub2; Sub2 calls Sub3.
(b) Main calls Sub2; Sub2 calls Sub3; Sub3 calls Sub1.
(c) Main calls Sub1; Sub1 calls Sub3; Sub3 calls Sub2.
Homework Answers
(a) Main calls Sub1; Sub1 calls Sub2; Sub2 calls Sub3.
In the last function call variables are visible
|
Y |
declared in sub1 procedure |
|
B,Z |
declared in sub2 procedure |
|
A,X,W |
declared in sub3 procedure |
--
b) Main calls Sub2; Sub2 calls Sub3; Sub3 calls Sub1.
In the last function call variables are visible
|
B |
declared in sub2 procedure |
|
X,W |
declared in sub3 procedure |
|
A,Y,Z |
declared in sub1 procedure |
--
(c) Main calls Sub1; Sub1 calls Sub3; Sub3 calls Sub2.
In the last function call variables are visible
|
Y |
declared in sub1 procedure |
|
X,W |
declared in sub3 procedure |
|
A,B,Z |
declared in sub2 procedure |
--
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