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Computer Science

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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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Please read the instructions carefully and keep in mind of the bolded phrases. You are NOT ALLOWED to use HashSet Create a project in NetBeans and name the project Hw06. The class will contain the following static methods: reverseS – A method that displays a string reversely on the console using the following signature: publicstaticvoidreverseS(Strings) printSub1 – print all substrings of a string (duplicated substrings are allowed, but loops are not allowed). The method signature: public static void printSub1(String s) printSub2 – print all substrings of a string (duplicated substrings are not allowed, but loops are allowed). The method signature: public static void printSub2(String s) Note: All methods should be RECURSIVE. Any predefined classes that are based on Set are not allowed. In the main method, read a string from the user and output the reversed string and substrings to the screen: Sample Run: Please input a string: abcdThe reversed string: dcbaThe substrings…
In Checkpoint A, the game will not yet be playable as a two-player game. It will be playable by you in a type of "solitaire mode." Implement these functions from the template following the description (specification) in their docstring: show_top_card() get_top_card() add_card_to_discard() check_racko() find_and_replace() play_hand() The main function to drive the game has been provided. Missing input/output statements are part of play_hand() and left for you to implement, guided by the sample input/output. None of the other functions left to implement use input or print. The case / capitalization of user input should be ignored. On any invalid user input, the program should exit with a non-zero exit code. Hint: Use Python Tutor. as much as possible when testing gameplay. Zybooks requires you specify all your inputs in advance and it is less enjoyable to play that way. Sample input/output 1 When the inputs are: no yes 1 yes 5 yes 7 The expected behavior is (inputs are shown in-line)…
please add comment in the code. Answer the questions in java eclipse. Thank you
You used forbidden methods. See below. Please update without any of the following in the code. Forbidden Built-ins/Methods/etc break, continue methods outside those permitted within allowed types for instance str.endswith list.index, list.count, etc. Keywords you definitely don't need: await, as, assert, async, class, except, finally, global, lambda, nonlocal, raise, try, yield The is keyword is forbidden, not because it's necessarily bad, but because it doesn't behave as you might expect (it's not the same as ==). built in functions: any, all, breakpoint, callable, classmethod, compile, exec, delattr, divmod, enumerate, filter, map, max, min, isinstance, issubclass, iter, locals, oct, next, memoryview, property, repr, reversed, round, set, setattr, sorted, staticmethod, sum, super, type, vars, zip If you have read this section, then you know the secret word is: argumentative. exit() or quit() If something is not on the allowed list, not on this list, then it is probably…
You have to use comment function to describe what each line does import java.io.BufferedReader; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; import java.util.List; public class PreferenceData { private final List<Student> students; private final List<Project> projects; private int[][] preferences; private static enum ReadState { STUDENT_MODE, PROJECT_MODE, PREFERENCE_MODE, UNKNOWN; }; public PreferenceData() { super(); this.students = new ArrayList<Student>(); this.projects = new ArrayList<Project>(); } public void addStudent(Student s) { this.students.add(s); } public void addStudent(String s) { this.addStudent(Student.createStudent(s)); } public void addProject(Project p) { this.projects.add(p); } public void addProject(String p) { this.addProject(Project.createProject(p)); } public void createPreferenceMatrix() { this.preferences = new…
When JUnit testing, which is the best practice? Group of answer choices: 1. When the method or constructor takes a numeric value, generate many random values for those values and test if all of them work. 2. You only need to test three possibilities, positive values, negative values, and 0. 3. Convert all numbers to String, and always compare those instead of the numbers themselves. 4. Never test an input that will throw an exception, because you should never need to pass an invalid input to a method or constructor.
Define the missing method. Use "this" to distinguish the local member from the parameter name. Learn how our autograder works 528040.3489652.qx3zqy7 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 } } // ===== end ===== // ===== Code from file CallCablePlan.java ===== import java.util.Scanner; public class CallCablePlan { publicstaticvoidmain(String [] args) { Scannerscnr=newScanner(System.in); CablePlanhouse1Plan=newCablePlan(); intuserNum; userNum=scnr.nextInt(); house1Plan.setNumDays(userNum); System.out.println(house1Plan.getNumDays()); } } // ===== end =====
In python
Hi, it is still giving me the same 5 errors as last time even after modifying the code. I tried reordering #include "student.h" and #include "bubble.h" in studentMain.cpp but it gave me more errors. Is this happening because I am compiling with the wrong command, I am compiling it all together like this: g++ studentMain.cpp bubble.cpp bubble.h student.h grades.txt. I have the modified code below and a reminder that I can only edit the code in the studentMain.cpp file: //studentMain.cpp #include <stdio.h>#include <stdlib.h>#include "student.h"#include "bubble.h" int main(){ // Create an array of 19 student pointers student *students[19]; // Allocate space for each student in the array for (int i = 0; i < 19; i++) { students[i] = (student *)malloc(sizeof(student)); } // Read in the data from the file FILE *fp = fopen("students.txt", "r"); if (fp == NULL) { printf("Error opening file\n"); return 1; } for (int i = 0; i < 19; i++) { fscanf(fp, "%s…
For each of the operators and methods listed above, explain what they do (experiment with code in Python, DON’T LOOK IT UP, and be sure to turn in the code that you used to figure it out (use comments to tell us which method or operator you are figuring out in each part of your code). • my_list.count(VALUE) • my_list.pop(VALUE) • my_list.reverse() • my_list.append(NEW_value) • my_list + my_next_list • len(my_list) 2- Explain what the following piece of code do. Write your answer in comments. my_list= ["twinkle", "twinkle", "little", "star", 4] print(my_list[slice(0, 3, 2)])
Tests: In the test_sun.py module, create tests for the planet objects. You can (and should) do this before you have written any Planet code at all. Implementation: In the sun.py module (see template), implement a Sun class as described in Section 10.4. Your Sun class should include the following methods: __init__, get_mass, get_radius, get_temperature, and __str__. Your __str__ method should include the following information for each planet: Name, distance from sun, radius, and mass. section 10.4
It will use a class called NameHelper (which you will write). This class will provide methods to load the data files and to fetch name rankings by year. The JavaFX class will be using NameHelper according to the following UML, so make sure your data helper has the methods defined below: What does the (~) mean in the attached diagram.