Assume that the public concrete class House is defined, which choice lists all the statements are always valid? 1. House h; II. House h = new House (); House h = new House (15, 3); IV. House [] h = new House [5]; Only I OI, II O II, III They are all valid. I, IV

Assume that the public concrete class House is defined, which choice lists all the statements are always valid? 1. House h; II. House h = new House (); House h = new House (15, 3); IV. House [] h = new House [5]; Only I OI, II O II, III They are all valid. I, IV

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

See similar textbooks

Similar questions

In C++ Q1.) Write a Review class that has: • These private data members: • string user: ID of the user • string item: ID of the item • double paid: the price of the item that the user buys • double rating: the rating that the user gives to the item • string review: the review content that the user gives to the item • These public member functions: • A default constructor to set all instance variables to a default value • A parameterized constructor (i.e., a constructor with arguments) to set all instance variables • A method for getting/setting the instance variables. • A method for printing the Review's information.
Given the class definition below overload the + operator to be able to add 2 objects of type Time. class Time{ private: int hours; int minutes; string zone; public: Time(int h, int m): hours(h), minutes(m){} void Display(); }; void Time:Display(){ cout<<"Time is: "<
Write a code for a banking program.a) In this question, first, you need to create a Customer class, this class should have:• 2 private attributes: name (String) and balance (double)• Parametrized constructor to initialize the attributes• Methods:i. public String toString() that gives back the name and balanceii. public void addPercentage; this method will take a percentage value andadd it to the balanceb) Second, you will create a driver class and ask the user to enter 6 customers’ informationand then you will create an array of Customer objects.c) Then you use this array used for various operations as shown in the output.• Using the array of customer objects, you need to search for all customers whohave less than $150• Using the array of customer objects, you need to get the average balance of thebalances in this array• Using the array of customer objects, you need to get the customer with thehighest balance and lowest balance• Using the array of customer objects, you need to show all…
QUESTION 16 What must be true of a class with one abstract method? O The class must also implement the Iterable interface Any derived class must implement the method The abstract method must have the static modifier O The method cannot specify a return value QUESTION 17 Suppose we wanted to design a set of classes for a veterinarian's office. Our Customer class looks like this: public class Customer { Pet [] pets; } Select all the statements that are true Once the size of the pets array has been set, it cannot be changed Because we're using an array, all pets must be the same A customer must have at least one pet We also need to declare a Pet class QUESTION 18 What is the proper use of an enumeration? To define a set of ordered values To enforce the use of the Comparable interface O To define, or enumerate, the values returned by a Random object generator O To define the classes in an inheritance hierarchy
Problem: Create a Fraction class with two private positive integer member variables numerator and denominator, one constructor with two integer parameters num and den with default values 0 and 1, one display function that print out a fraction in the format numerator/denominator in the proper form such as 2/3 or ½ . Note: 2/4 should be displayed as ½.
Given the following class declaration, it is imperative that the copy constructor, destructor and copy assignment operator are included in the class. class Person{ public: Person(const char* name); -Person(); Person(const Person& original); Person& operator=(const Person&); string ToString()const; private: char* _name; }3; True False
Analysis the following class definition and answer the following question. class Store{ private int itemID, qty, double price; void setQty(int quantity){ qty = quantity; } protected void setPrice (double p){ price = p; } double amount(){ return qty*price; } } What is the modifier of the amount? a. double b. public c. void d. No modifier e. protected
T/F Example Code Ch 09-2Assume that Poodle is a derived class of Dog and that Dog d = new Dog(...) and Poodlep = new Poodle(...) where the ... are the necessary parameters for the two classes.7. Refer to Example Code Ch 09-2: The assignment statement d = p; is legal even though d is not aPoodle.
Write C++ code for a class named MuniBus that has the following private member variables: int totalPassengers; double faresCollected; and the following public member functions: void passengerBoard() - adds 2.50 to faresCollected and adds 1 to totalPassengers double getFaresCollected() - returns faresCollected int getPassengers() - returns totalPassengers void reset() - sets totalPassengers and faresCollected to zero MuniBus() - default constructor. Initializes both totalPassengers and faresCollected to 0 MuniBus(int tp, double fc) - constructor which initializes totalPassengers to tp, faresCollected to fc ~MuniBus() - destructor. Prints out a message saying that the bus is being destroyed, and also prints out totalPassengers and faresCollected. Write the class declaration and implement all of the constructors, the destructor, and member functions. You do not need to demonstrate using your class or show output.
2. Student (extend the class Person) that has the following: Data Fields: private int ID prvate double grade Constructor: Constructor to create a Student object with specifiedname address, ID & grade. Methods: Accessor and mutator methods for all data fields.
use the following partial class definitions:public class A1{public int x;private int y;public int z;…}public class A2 extends A1{public int a;private int b; …}public class A3 extends A2{private int q;…} 2) Which of the following lists of instance data are accessible in class A2?a) x, y, z, a, bb) x, y, z, ac) x, z, a, bd) z, a, be) a, b
1. A method stub is a) a short method b)a method with an abrupt end c)a method whose header has not yet been written d) a method whose statements have not yet been written 2 An abstract class can always be instantiated as an object can sometimes be instantiated as an object can often be instantiated as an object can never be instantiated as an object 3)When a derived class defines a member method that has the same name, parameters, and return type as a base class's method, the member method is said to overload the base class's method overreach the base class's method override the base class's method overshadow the base class's method 4. What would be the best code to print out all the elements of an array for (int i = 0 ; i <= arry.length ; i++ ) System.out.println(arry[i]); for (int i = 0 ; i < arry.length ; i++ ) System.out.println(arry[i]); for (int i…