scheme2_worksheet - CSCC24 Principles of Programming...

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CSCC24 – Principles of Programming Languages Functional Programming - Scheme Defining Functions From last class: Parameter: integer n ≥ 0. Result: sum of integers from 0 to n. ( define (sum-n n) (cond ) ) What could/should we change if ____________? (sum-list x): Given x a list of numbers, returns the sum of all the numbers in x. ( define (sum-list x) (cond How would you define sum-n if n could be a list of s-expressions and you only wanted to sum those elements that are numbers? Recursive Scheme Function: Length (Note: There is a built-in length function. ) ( define (length x) (cond ) ) This is called “cdr-recursion” which processes the car of the list and then has a recursive call on the cdr of the list. More cdr recursion (append x y): 1) We recurse through the first list, taking it apart and adding it onto the second list. _____________________________________ _____. Let's show some examples of this: (append '(a) '(b c)) (append '(a b c) '(d (e f) g)) There are two bases cases. In the code below, the first base case is simply for efficiency (no need to recreate x when y is
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