Answered: Haskell 1. Show how the meaning of the…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Haskell 1. Show how the meaning of the following curried function definition can be formalized in terms of lambda expressions: mult :: Int -> Int -> Int -> Int mult x y z = x * y * z 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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