1. Write a SCHEME function, named (tree-size T), which takes a tree node, T, and returns the size (i.e. the number of nodes) of the tree rooted at T.

Computer Networking: A Top-Down Approach (7th Edition)
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Chapter1: Computer Networks And The Internet
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Answer using scheme language R5RS

Bmary Trees
Recall the following code from the lecture slides:
(define (make-tree value left right)
(list value left right))
(define (value T) (car T))
(define (right T) (caddr T))
(define (left T)
(cadr T))
1. Write a SCHEME function, named (tree-size T), which takes a tree node, T, and returns the size
(i.e. the number of nodes) of the tree rooted at T.
2. Write a SCHEME function named (tree-depth T) which takes a tree node, T, as a parameter and
returns the depth of the tree rooted at T. For the purpose of this exercise, the depth of a tree rooted
at T is one plus the maximum of the depths of its two children.
3. Define a SCHEMA function named (count-pred P tree) which given a binary tree and predicate
function, P, applies the predicate to each of the values in the tree and returns the number of values
for which the predicate returns #t (true).
4. Define a SCHEME function named count-one-child which returns the number of internal nodes
of a binary tree which have exactly one child.
Binary Search Trees
(define (insert x T)
(cond ((null? T) (make-tree x '() '()))
((eq? x (value T)) T)
((< x (value T)) (make-tree (value T)
(right T)))
(insert x (left T))
((> x (value T)) (make-tree (value T)
(left T)
(insert x (right T))))))
Transcribed Image Text:Bmary Trees Recall the following code from the lecture slides: (define (make-tree value left right) (list value left right)) (define (value T) (car T)) (define (right T) (caddr T)) (define (left T) (cadr T)) 1. Write a SCHEME function, named (tree-size T), which takes a tree node, T, and returns the size (i.e. the number of nodes) of the tree rooted at T. 2. Write a SCHEME function named (tree-depth T) which takes a tree node, T, as a parameter and returns the depth of the tree rooted at T. For the purpose of this exercise, the depth of a tree rooted at T is one plus the maximum of the depths of its two children. 3. Define a SCHEMA function named (count-pred P tree) which given a binary tree and predicate function, P, applies the predicate to each of the values in the tree and returns the number of values for which the predicate returns #t (true). 4. Define a SCHEME function named count-one-child which returns the number of internal nodes of a binary tree which have exactly one child. Binary Search Trees (define (insert x T) (cond ((null? T) (make-tree x '() '())) ((eq? x (value T)) T) ((< x (value T)) (make-tree (value T) (right T))) (insert x (left T)) ((> x (value T)) (make-tree (value T) (left T) (insert x (right T))))))
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