
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
python3:
Class vs Instance variable
- Make a class names Foo
- Add a class variable to foo called x and initialize it to 5
- Add an instance variable to foo called y and initialize it to 100
- Make an instance of the class, call it f
- Using Foo., print out the value of x (proper etiquette for class variables)
- Using f., Print out the value of y (proper etiquette for instance/self. variables)
Hint: remember that class variables are the ones where their value is the same for all instances/clones. And instance variable (which you declare inside the __init__ method with the self. preface, are unique to each clone. When you print a class variable the proper way is to use classname . (for example Foo.x) and when you print an instance variable you use the instance handle (for example f.y.)
Expert Solution

This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by stepSolved in 4 steps with 2 images

Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- Write a python code for both 1 and 2 use random inputs for each variablearrow_forwardcorrect the codearrow_forwardCharge Account Validation Using Java programming Create a class with a method that accepts a charge account number as its argument. The method should determine whether the number is valid by comparing it to the following list of valid charge account numbers:5658845 4520125 7895122 8777541 8451277 13028508080152 4562555 5552012 5050552 7825877 12502551005231 6545231 3852085 7576651 7881200 4581002These numbers should be stored in an array. Use a sequential search to locate the number passed as an argument. If the number is in the array, the method should return true, indicating the number is valid. If the number is not in the array, the method should return false, indicating the number is invalid.Write a program that tests the class by asking the user to enter a charge account number. The program should display a message indicating whether the number is valid or invalid.arrow_forward
- CSCI 140/L Java Project: Menu-Driven System Part A Write a menu-driven program that will give the user the three choices: 1) Wage calculator, 2) Coupon Calculator, and 3) Exit. Class Name: PartA Wage Calculator: For the wage calculator, prompt for the name and hourly pay rate of an employee. Here the hourly pay rate is a floating-point number, such as $9.25. Then ask how many hours the employee worked in the past week. Be sure to accept fractional hours. Compute the pay. Any overtime work (over 40 hours per week) is paid at 150 percent of the regular wage (1.5 the hourly pay rate). Print the employee's name, regular hours worked, regular hours pay, overtime hours worked (do not show overtime hours, if there are none), overtime hours pay (do not show overtime pay if there is none), and total pay. [Do not prompt for overtime hours] Coupon Calculator: For the coupon calculator, the total coupon amount is calculated based on the type of items purchased. Ask for the shopper's total purchase…arrow_forwardCollapse Problem #2 Complete the class Problem2, the program does the following: • The program prompts the user to enter an integer. • The program continues to prompt the user for more integers as long as the sum of all values entered is between 1 and 50. • If the sum of all values entered is NOT between 1 and 50, Java the program stops taking integers, then display the value of sum. Here are two sample outputs, your output should look exactly the same as follows: Enter an integer: 23 Enter an integer: 1 I Enter an integer: -2 Enter an integer: 19 Enter an integer: -25 Enter an integer: 4 Enter an integer: 9 Enter an integer: -20 Enter an integer: -5 Enter an integer: -12 AK -8 lacBook Airarrow_forwardConstant Assignment • The compiler will issue an error if you try to change the value of a constant • In Java, we use the final modifier to declare a constant final int x= 69; Add x= x+10 What is the result?arrow_forward
- please quickly thanks ! use javaarrow_forwardInteger userValue is read from input. Assume userValue is greater than 1000 and less than 99999. Assign tensDigit with userValue's tens place value. Ex: If the input is 15876, then the output is: The value in the tens place is: 7 2 3 public class ValueFinder { 4 5 6 7 8 9 10 11 12 13 GHE 14 15 16} public static void main(String[] args) { new Scanner(System.in); } Scanner scnr int userValue; int tensDigit; int tempVal; userValue = scnr.nextInt(); Your code goes here */ 11 System.out.println("The value in the tens place is: + tensDigit);arrow_forwardFlight assignment runs but there is no imput values for the user to interact when running the program. Kindly fix this issue.import java.util.*; class Flight { String airlineCode; int flightNumber; char type; // D for domestic, I for international String departureAirportCode; String departureGate; char departureDay; int departureTime; String arrivalAirportCode; String arrivalGate; char arrivalDay; int arrivalTime; char status; // S for scheduled, A for arrived, D for departed public Flight(String airlineCode, int flightNumber, char type, String departureAirportCode, String departureGate, char departureDay, int departureTime, String arrivalAirportCode, String arrivalGate, char arrivalDay, int arrivalTime) { this.airlineCode = airlineCode; this.flightNumber = flightNumber; this.type = type; this.departureAirportCode = departureAirportCode; this.departureGate = departureGate;…arrow_forward
- finish code in python No hand written and fast answer with explanationarrow_forward1. Instructions: The program you will analyze is shown below. The program listing contains a class definition followed by a main program. Your task is to find and write the missing code lines to make the program work correctly. Use the output statements from the print() statements to reveal this mystery :-) Please write the missing code lines clearly in the empty boxes. ###### start of Rectangle class class Rectangle: def init (self, length, width): self.length length self.width = width def GetLength (self): return self.length def GetWidth(self): return self.width def GetArea (self): return self.length * self.width def SetScale(self, scale): self.length self.length * scale self.width self.width * scale #### start of main program rec Rectangle (3,5) %3D print ('Rectangle Area: ', rectangleArea) for ES in range (2,5) : width = rec.GetWidth()arrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
- Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill EducationStarting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSONDigital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON
- C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSONDatabase Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage LearningProgrammable Logic ControllersComputer ScienceISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education

Database System Concepts
Computer Science
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:McGraw-Hill Education

Starting Out with Python (4th Edition)
Computer Science
ISBN:9780134444321
Author:Tony Gaddis
Publisher:PEARSON

Digital Fundamentals (11th Edition)
Computer Science
ISBN:9780132737968
Author:Thomas L. Floyd
Publisher:PEARSON

C How to Program (8th Edition)
Computer Science
ISBN:9780133976892
Author:Paul J. Deitel, Harvey Deitel
Publisher:PEARSON

Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781337627900
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning

Programmable Logic Controllers
Computer Science
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education