Answered: python help Q1: Over or Under Define a…

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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Q1: Over or Under

Define a procedure over-or-under which takes in a number x and a number y and returns the following:

-1 if x is less than y
0 if x is equal to y
1 if x is greater than y

*Hint: You can use cond

(define (over-or-under x y)

'YOUR-CODE-HERE

)

;;; Tests

(over-or-under 1 2)

; expect -1

(over-or-under 2 1)

; expect 1

(over-or-under 1 1)

; expect 0

Q2: Filter

Write a procedure filter-lst, which takes a predicate f and a list lst, and returns a new list containing only elements of the list that satisfy the predicate. The output should contain the elements in the same order that they appeared in the original list.

(define (filter-lst f lst)

'YOUR-CODE-HERE

)

;;; Tests

(define (even? x)

(= (modulo x 2) 0))

(filter-lst even? '(0 1 1 2 3 5 8))

; expect (0 2 8)

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