13.4 CodingBird (Array): flip Create an array of ints length 7, return the elements in reverse order without the first element, so {1, 2, 3, 4, 5, 6, 7) becomes (7, 6, 5, 4, 3, 2). Ex: If the input is: 1 2 3 4 567 the output is: 7 6 5 4 3 2 Ex: If the input is: 2 4 6 8 10 12 14 the output is: 14 12 10 864 449182.3196742.qx3zqy7 LAB ACTIVITY 1 import java.util.Scanner; 3 public class flip { 4 5 6 7} 8 13.4.1: CodingBird (Array): flip public static void main(String[] args) { /* Type your code here. */ } flip.java 0/10 Load default template...

13.4 CodingBird (Array): flip Create an array of ints length 7, return the elements in reverse order without the first element, so {1, 2, 3, 4, 5, 6, 7) becomes (7, 6, 5, 4, 3, 2). Ex: If the input is: 1 2 3 4 567 the output is: 7 6 5 4 3 2 Ex: If the input is: 2 4 6 8 10 12 14 the output is: 14 12 10 864 449182.3196742.qx3zqy7 LAB ACTIVITY 1 import java.util.Scanner; 3 public class flip { 4 5 6 7} 8 13.4.1: CodingBird (Array): flip public static void main(String[] args) { /* Type your code here. */ } flip.java 0/10 Load default template...

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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7.13 LAB: Vending machine Given two integers as user inputs that represent the number of drinks to buy and the number of bottles to restock, create a VendingMachine object that performs the following operations: Purchases input number of drinks Restocks input number of bottles Reports inventory A VendingMachine's initial inventory is 20 drinks. Ex: If the input is: 5 2 the output is: Inventory: 17 bottles GIVEN: class VendingMachine: def __init__(self): self.bottles = 20 def purchase(self, amount): self.bottles = self.bottles - amount def restock(self, amount): self.bottles = self.bottles + amount def get_inventory(self): return self.bottles def report(self): print('Inventory: {} bottles'.format(self.bottles)) if __name__ == "__main__": # TODO: Create VendingMachine object # TODO: Purchase input number of drinks # TODO: Restock input number of bottles # TODO: Report inventory
11.8 LAB: Dates Complete the code to implement the following operations: Complete read_date(): Read an input string representing a date in the format yyyy-mm-dd. Create a date object from the input string. Return the date object. Call read_date() to read four (unique) date objects and store the date objects in a list. Call sorted() to sort the list of date objects, earliest first. Store the sorted dates in a new list. Output the sorted_dates, in the format mm/dd/yy. Hint: Use strftime() to format the date outputs. (See resource below.) Output the number of days between the last two dates in the sorted list as a positive number. Output the date that is 3 weeks from the most recent date in the format "July 4, 1776". Hint: Use timedelta() to set a duration of time for the arithmetic on date objects. (See resources below.)Ex: timedelta(days=50, seconds=27, hours=8, weeks=2) will define a duration of 50 days + 27 seconds + 8 hours + 2 weeks. Output the full name of the day…
22.3 LAB: Remove all even numbers from a list Write the remove_evens() function, which receives a list of integers as a parameter and returns a new list of integers containing only the odd numbers from the original list. The main program outputs values of the returned list. Hint: If the original list has even numbers, then the new list will be smaller in length than the original list and should have no blank elements. Ex: If the list passed to the remove_evens() function is [1, 2, 3, 4, 5, 6, 7, 8, 9], then the function returns and the program output is: [1, 3, 5, 7, 9] Ex: If the list passed to the remove_evens() function is [1, 9, 3], then the function returns and the program output is: [1, 9, 3]
6.9 LAB: All permutations of names Write a program that lists all ways people can line up for a photo (all permutations of a list of Strings). The program will read a list of one word names (until -1), and use a recursive method to create and output all possible orderings of those names, one ordering per line. When the input is: Julia Lucas Mia -1 then the output is (must match the below ordering): Julia Lucas Mia Julia Mia Lucas Lucas Julia Mia Lucas Mia Julia Mia Julia Lucas Mia Lucas Julia import java.util.Scanner;import java.util.ArrayList; public class PhotoLineups { // TODO: Write method to create and output all permutations of the list of names.public static void allPermutations(ArrayList<String> permList, ArrayList<String> nameList) {} public static void main(String[] args) {Scanner scnr = new Scanner(System.in);ArrayList<String> nameList = new ArrayList<String>();ArrayList<String> permList = new ArrayList<String>();String name;//…
TODO 1.2 Make an array with the values [100, 50, 32, 1000]. Put the results in a variable named array_from_list. # TODO 8.2 array_from_list = print(f"array_from_list output: \n{array_from_list}") print(f"array_from_list shape: {array_from_list.shape}") todo_check([ (array_from_list.shape == (4,),'array_from_list did not have the shape (4,)'), (list(array_from_list) == [100,50,32,1000],'array_from_list did not contain the values [100, 50, 32, 1000]') ])
22.4 LAB: Adjust list by normalizing - functions (Use Python) When analyzing data sets, such as data for human heights or for human weights, a common step is to adjust the data. This can be done by normalizing to values between 0 and 1, or throwing away outliers. For this program, adjust the values by subtracting the smallest value from all the values. Input values should be added to the list until -1 is entered. Ex: If the input is: 30 50 10 70 65 -1 the output is: 20 40 0 60 55 Your program must define and call the function:get_minimum_int(nums)
13.12 LAB: Merge sort The class is the same as shown at the end of the Merge sort section, with the following changes: Numbers are entered by a user in a separate helper method, readNums(), instead of defining a specific array in main(). The first number is how many integers to be sorted, and the rest are the integers. Output of the array has been moved to the method printNums(). An output has been added to mergeSort(), showing the indices that will be passed to the recursive method calls. Add code to the merge sort algorithm to count the number of comparisons performed. Add code at the end of main() that outputs "comparisons: " followed by the number of comparisons performed (Ex: "comparisons: 12") Hint: Use a static variable to count the comparisons. Note: Take special care to look at the output of each test to better understand the merge sort algorithm. Ex: When the input is: 6 3 2 1 5 9 8 the output is: unsorted: 3 2 1 5 9 8 0 2 | 3 5 0 1 | 2 2 0 0 | 1 1 3 4 | 5 5 3 3 | 4…
8.27 LAB: Scrabble points Scrabble is a word game in which words are constructed from letter tiles, each letter tile containing a point value. The value of a word is the sum of each tile's points added to any points provided by the word's placement on the game board. Write a program using the given dictionary of letters and point values that takes a word as input and outputs the base total value of the word (before being put onto a board). Ex: If the input is: PYTHON the output is: 14 python tile_dict = { 'A': 1, 'B': 3, 'C': 3, 'D': 2, 'E': 1, 'F': 4, 'G': 2, 'H': 4, 'I': 1, 'J': 8, 'K': 5, 'L': 1, 'M': 3, 'N': 1, 'O': 1, 'P': 3, 'Q': 10, 'R': 1, 'S': 1, 'T': 1, 'U': 1, 'V': 4, 'W': 4, 'X': 8, 'Y': 4, 'Z': 10 }
5.16 LAB: Cryptographic Hashing Algorithms Encryption methods, such as the Caesar Cipher encryption, allow us to encrypt and decrypt text using a special key. Another method of encrypting text / passwords is called hashing. Hashing uses special algorithms to 'scramble' the text, which is tougher to be hacked. The hash function can take numbers, letters, and symbols as input, then the function applies one of the special algorithms to output the scrambled text. The longer the output string is, the harder to hack the hashed data. The difference between hashing and the Caesar Cipher encryption is that one cannot 'decrypt' a hashed data to its original text. Since a hashed data cannot be decrypted, a user must enter the original text, which will be hashed by the program. Then the program compares the hashed value with the hashed data stored previously for the original text. A salt is used, at times, to create a random sequence that is added to the original text before using the hashing…
8.13 LAB: Library book sorting Two sorted lists have been created, one implemented using a linked list (LinkedListLibrary linkedListLibrary) and the other implemented using the built-in Vector class (VectorLibrary vectorLibrary). Each list contains 100 books (title, ISBN number, author), sorted in ascending order by ISBN number. Complete main() by inserting a new book into each list using the respective LinkedListLibrary and VectorLibrary InsertSorted() methods and outputting the number of operations the computer must perform to insert the new book. Each InsertSorted() returns the number of operations the computer performs. Ex: If the input is: The Catcher in the Rye 9787543321724 J.D. Salinger the output is: Number of linked list operations: 1 Number of vector operations: 1 Which list do you think will require the most operations? Why? Main.cpp: #include "LinkedListLibrary.h"#include "VectorLibrary.h"#include "BookNode.h"#include "Book.h"#include <fstream>#include…
9.12 LAB: File name change PYTHON A photographer is organizing a photo collection about the national parks in the US and would like to annotate the information about each of the photos into a separate set of files. Write a program that reads the name of a text file containing a list of photo file names. The program then reads the photo file names from the text file, replaces the "_photo.jpg" portion of the file names with "_info.txt", and outputs the modified file names. Assume the unchanged portion of the photo file names contains only letters and numbers, and the text file stores one photo file name per line. If the text file is empty, the program produces no output. Ex: If the input of the program is: ParkPhotos.txt and the contents of ParkPhotos.txt are: Acadia2003_photo.jpg AmericanSamoa1989_photo.jpg BlackCanyonoftheGunnison1983_photo.jpg CarlsbadCaverns2010_photo.jpg CraterLake1996_photo.jpg GrandCanyon1996_photo.jpg IndianaDunes1987_photo.jpg LakeClark2009_photo.jpg…
19.3 LAB: Hailstone sequence Given a positive integer n, the following rules will always create a sequence that ends with 1, called the hailstone sequence: If n is even, divide it by 2 If n is odd, multiply it by 3 and add 1 (i.e. 3n +1) Continue until n is 1 Write a program that reads an integer as input and prints the hailstone sequence starting with the integer entered. Format the output so that ten integers, each separated by a tab character (\t), are printed per line. The output format can be achieved as follows:print(n, end='\t') Ex: If the input is: 25 the output is: 25 76 38 19 58 29 88 44 22 11 34 17 52 26 13 40 20 10 5 16 8 4 2 1 Use Python, please.