private String name; private int code; and following constructor: public Item(String n, int c) { name = n; code = c; } Now, we want to write a class called Electronicitem that inherits th properties of class Item as follows having only one data field: public class Electronicitem extends Item { private double price; The constructor of class Electronicitem can be written as follows: a. public Electronicitem(String n, int c, double p) { this(n, c); price = p; } b.public Electronicitem(String n, int c, double p) { super(n, c); price = p; } c. public Electronicitem (String n, int c, double p) { Item.super(n, c); price = p; } d. public Electronicitem (String n, int c, double p) { Item.name = n; Item.code = c; price = p; }

private String name; private int code; and following constructor: public Item(String n, int c) { name = n; code = c; } Now, we want to write a class called Electronicitem that inherits th properties of class Item as follows having only one data field: public class Electronicitem extends Item { private double price; The constructor of class Electronicitem can be written as follows: a. public Electronicitem(String n, int c, double p) { this(n, c); price = p; } b.public Electronicitem(String n, int c, double p) { super(n, c); price = p; } c. public Electronicitem (String n, int c, double p) { Item.super(n, c); price = p; } d. public Electronicitem (String n, int c, double p) { Item.name = n; Item.code = c; price = p; }

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

Java Program This assignment requires one project with two classes. Class Employee Class Employee- I will attach the code for this: //Import the required packages. import java.text.DecimalFormat; import java.text.NumberFormat; //Define the employee class. class Employee { //Define the data members. private String id, lastName, firstName; private int salary; //Create the constructor. public Employee(String id, String lastName, String firstName, int salary) { this.id = id; this.lastName = lastName; this.firstName = firstName; this.salary = salary; } //Define the getter methods. public String getId() { return id; } public String getLastName() { return lastName; } public String getFirstName() { return firstName; } public int getSalary() { return salary; } //Define the method to return the employee details. @Override public String toString() { //Use number format and decimal format //to…
2. Consider the following class, which represents a price in dollars and cents: class Price { private: int dollars; int cents; public: Price() { dollars = cents = 0; } Price(int d, int c) { dollars = d; cents = c; } Price operator+(Price&); void printer(); }; Implement the overloaded + operator to compute the sum of two Price objects, and return the result as a Price object containing the sum. You may assume that all price objects contain valid data, i.e. dollars>=0 and 0<=cents<=99.
6. Given: class Pet { public: virtual void eat() { cout eat(); } What is the result of compiling and running the above program? m. The program compiles and crashes when it runs. i. The program compiles and runs, printing "Pet::eat" j. The program compiles and runs, printing "Cat::eat" The program compiles and runs to completion without printing anything. n. o. None of the above. k. The program fails to compile because the method eat is not marked virtual in Cat. I. The program fails to compile for some other reason.
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
consider the following code snippet: class Comp{ int g; public: Comp0{g=-1;} Comp(int y){g=y:} }; class Child: public Comp{ const int y; public: Child(int v) {y=v; } void print0{ cout <<"inside child class " <
Modify and rewrite the Food class to an abstract class, so that no instance of Food class can be created
Consider the following classes Number and NumberPair 1 public class Number 2 { 3 public int num; //public to access it from objects of other classes 4 5 public Number(int number) 6 { 7 num = number; 8 } 9 } 10 //--------------------------------------------------------- 11 public class NumberPair 12 { 13 private Number n1,n2; //fields of the class are n1 and n2 of type Number 14 15 public NumberPair() 16 { 17 n1 = new Number(5); 18 n2 = new Number(10); 19 } 20 21 22 public void swapObjects(Number number1, Number number2) 23 { 24 Number tmp = number1; 25 number1 = number2; 26 number2 = tmp; 27 } 28 29 public void test() 30 { 31 swapObjects(n1,n2); 32 } 33 } 1. Assume we create an instance NumberPair pair = new NumberPair(); What will be the value of pair.n1.num and pair.n2.num, after calling method pair.test()? Explain your answer! 2. Write a method swapFields(Number number1, Number number2) that swaps the values of the fields num of two Number obj
A programmer has submitted the following class declaration for approval. This will be part of a program that tracks departments within a company and employees assigned to those departments. class Employee { public: Employee(); string getName(); long getldentifier(); Dollars getSalary(): Department worksln(): void assignTo (Department"); Employee getSupervisor() (return dept->getManager();) private: string name; long identifier; Department" dept; Dollars salary: Based upon this information, which of the C++ checklist items appear to be in violation? O Interface completeness O Meaningful names O Undocumented pre-conditions O All data members private O Every constructor initializes every data member O Appropriate treatment of default constructor O Appropriate treatment of the Big 3 O Appropriate relational operators O Appropriate output function D Const correctness
Java Program This assignment requires one project with two classes. Class Employee Class Employee- I will attach the code for this: //Import the required packages. import java.text.DecimalFormat; import java.text.NumberFormat; //Define the employee class. class Employee { //Define the data members. private String id, lastName, firstName; private int salary; //Create the constructor. public Employee(String id, String lastName, String firstName, int salary) { this.id = id; this.lastName = lastName; this.firstName = firstName; this.salary = salary; } //Define the getter methods. public String getId() { return id; } public String getLastName() { return lastName; } public String getFirstName() { return firstName; } public int getSalary() { return salary; } //Define the method to return the employee details. @Override public String toString() { //Use number format and decimal format //to…
C----------insk.
Assume that class Item has following two private data fields: private String name; private int code; and following constructor: public Item(String n, int c) { name = n; code = c; } Now, we want to write a class called ElectronicItem that inherits the properties of class Item as follows having only one data field: public class ElectronicItem extends Item { private double price; The constructor of class ElectronicItem can be written as follows: public ElectronicItem(String n, int c, double p) { this(n, c); price = p; } public ElectronicItem (String n, int c, double p) { Item.super(n, c); price = p; } public ElectronicItem (String n, int c, double p) { Item.name = n; Item.code = c; price = p; } public ElectronicItem(String n, int c, double p) { super(n, c); price = p; }
In this assignment, you will make two classes,Student and Instructor, that inherit from a superclass Person. The implementation of class Person is given below. public class Person{private String name;private int age; public Person(){name="";age=0;}/**Create a person with a given name and age.@param name the name@param age the age*/public Person(String name, int age){this.name = name;this.age = age;} /**Get the name.@return the name*/public String getName(){ return name;}/**Change the name.@param name the name*/public void setName(String name){ this.name = name;}/**Get the age.@return the age*/public int getAge(){ return age;}/**Change the age.@param age the age*/public void setAge(){ this.age = age;}/**Convert person to string form.*/public String toString(){return "Name: " + name + "\t" + "Age: " + age;}} You will also need to write a test program to test the methods you write for these two classes. The implementation details are described as follows. Stage 1:In the first file…