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You can only use built in Lisp functions and you cannot use setq function. Write a...

You can only use built in Lisp functions and you cannot use setq function.

Write a function in Lisp called f7 that returns the element at a given location of a list. The locations start at 0. Example: (f7 ‘(c (a b) (d c) (x y)) 2) returns (d c)

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Answer #1

(elt '(c (a b) (d c) (x y)) 2)

returns (d c)

Here f7 is elt, a function in lisp. It allows returning list elements through given index. Here the given index is 2. Therefore, (d c) comes in second index starting from zeroth index.

For example:

(elt '(m n o p q r) 2)

Returns - > o because it comes in the second index.

elt function always starts with index zero.

m has index zero.

n has index one.

o has index two.

p has index three.

q has index four.

r has index five.

As in the function query index 2 is called. Therefore o with index 2 is returned.

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