Procedure A has static depth 3 and defines a variable which is visible in a nested subprocedure B. The nesting depth between procedure A and procedure B is 1 (that is, B is directly nested inside A). What is the static depth of B?

3

1

4

2

Consider the following program: procedure Main is

A : Integer;

B : Integer;

procedure Sub1(X: Integer) is B, C : Integer;

begin

B := 2;

C := 3;

A := B + C;

end;

begin

A := 1;

B := 1;

Sub1(B);

end;

What is the reference to B in the expression A : = B + C (in terms of chain-offset/local offset)?

		(0,3)
		(1,4)
		(1,3)
		(0,4)

In a static scoped language that uses static chaining as an implementation technique, references to non-local variables can be represented as:

		Static chain length/Local offset
		Static depth/Local offset
		Chain offset/Local offset
		Chain offset/Static depth

When the system uses static chain to access nonlocal variables, which of the following are true?

		References to variables in scopes beyond the static parent cost more than references to locals
		References to variables in scopes beyond the static parent cost less than references to locals
		Both local and nonlocal variables are stored in the same activation record instance
		Nonlocal variables are stored in activation record instances of static ancestors