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2. A positive integer is "perfect" if it equals the sum of all of its factors, excluding the number itself. Using a list comprehension and the function "factors", define a function "perfects ::

2. A positive integer is "perfect" if it equals the sum of all of its factors, excluding the number itself. Using a list comprehension and the function "factors", define a function "perfects ::

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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2. A positive integer is "perfect" if it equals the sum of all of its factors, excluding the number itself. Using a list comprehension and the function "factors", define a function "perfects :: Int -> [Int]" that returns the list of all perfect numbers up to a given limit. For example (in GHCI): > perfects 500 [6,28,496] Note that "factors" is just: factors: Int -> [Int] factors n = [x | x Bool" which returns "True" if the given "Int" is perfect, and "False" otherwise. Then use "isperfect" as a guard in a list comprehension to filter out all of the non-perfect integers (i.e., to keep only the perfect integers).
Transcribed Image Text:2. A positive integer is "perfect" if it equals the sum of all of its factors, excluding the number itself. Using a list comprehension and the function "factors", define a function "perfects :: Int -> [Int]" that returns the list of all perfect numbers up to a given limit. For example (in GHCI): > perfects 500 [6,28,496] Note that "factors" is just: factors: Int -> [Int] factors n = [x | x Bool" which returns "True" if the given "Int" is perfect, and "False" otherwise. Then use "isperfect" as a guard in a list comprehension to filter out all of the non-perfect integers (i.e., to keep only the perfect integers).
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