Suppose the following foo function was called from when the current referencing environment consisted only of the top level frame. If the functio was called as shown below, how many reference frames will the referencing environment consist of once the base case is reached? (define foo (lambda (n) (if (

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Author:James Kurose, Keith Ross
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Suppose the following foo function was called from when the current
referencing environment consisted only of the top level frame. If the function
was called as shown below, how many reference frames will the referencing
environment consist of once the base case is reached?
(define foo (lambda (n)
(if (< n 1)
-1 base case
(if (even? n)
(+ n (foo (-n 1)))
(- n (foo (-n 1)})
i call to foo
(foo 5)
10
O1
O2
Transcribed Image Text:Suppose the following foo function was called from when the current referencing environment consisted only of the top level frame. If the function was called as shown below, how many reference frames will the referencing environment consist of once the base case is reached? (define foo (lambda (n) (if (< n 1) -1 base case (if (even? n) (+ n (foo (-n 1))) (- n (foo (-n 1)}) i call to foo (foo 5) 10 O1 O2
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