Starting Out with Java: Early Objects Plus MyLab Programming with Pearson eText -- Access Card Package (6th Edition)
6th Edition
ISBN: 9780134543659
Author: Tony Gaddis
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 10, Problem 6PC
FileArray Class
Design a class that has a static method named writeArray. The method should take two arguments: the name of a file and a reference to an int array. The file should be opened as a binary file, the contents of the array should be written to the file, and then the file should be dosed.
Write a second method in the class named readArray. The method should take two arguments: the name of a file and a reference to an int array. The file should be opened, data should be read from the file and stored in the array, and then the file should be closed. Demonstrate both methods in a
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Using Classes Write a program that inputs, processes, and outputs a set of student records organized as a vector of class StudentRec objects.
write a program where each student record is constructed using the class StudentRec.
The variables in this case are "private" and the functions are "public."
Note: only the first_name and last_name variables will require "getter" functions that return the name in all caps:
get_first_name_upper() and get_last_name_upper() functions.
Your class declaration section should look something like this:
class StudentRec
{
private:
string last_name = ""; // Last name
string first_name = ""; // First name
int year_grad = 0; // Year expected to graduate
float gpa = 0.0; // Current gpa
public:
void set_last_name(string last_name_param);
string get_last_name() const;
string get_last_name_upper() const;
// the rest of the "setter" and "getter" functions for each variable above go…
Read Data
Write a function that reads in data from a file using the prototype below. The function can define and open the file, read the names and marks into the arrays and keep track of how many names there are in numElts, and then closes the file. The list of names and marks can be found at the end of the lab and copied into a text file.
void getNames(string names[], int marks[], int& numElts);
Display Data
Write a function to display the contents of names and marks using the prototype given below.
void displayData(const string names[], const int marks[], int numElts);
Linear Search
Write the searchList function given the prototype below so that it searches for a given name. The functions returns and int which is the index of the name found.
The main program will decide if -1 is returned then it will say name is not found otherwise it will write out the name and the mark for that name.
int linearSearch(const string list[], int numElts, string value);…
EmpFromFile
Implement a function readEmpFromFile that takes a FILE * as the only argument and returns a pointer to a struct employee. This function should read the information from the file (reversing what writeEmpToFile does), create a new employee and fill in the data. If the FILE has no more info (is at end of file), this function should return NULL. This function must also ensure any employee actually created (not the NULL) is added to the array (as is done in createEmployee).
Change main to load employees from a file using a command called LOAD which is given to the program using (using your readEmpFromFile function you just wrote).
void main(void) {
int end = 1;
char * command;
char buff[256];
char * findEmp;
char findBuff[256];
char * sortType;
char sortBuff[256];
char hire[] = "HIRE";
char list[] = "LIST";
char quit[] = "QUIT";
char find[] = "FIND";
char fire[] = "FIRE";
char _sort[] = "SORT";
char salary[] =…
Chapter 10 Solutions
Starting Out with Java: Early Objects Plus MyLab Programming with Pearson eText -- Access Card Package (6th Edition)
Ch. 10.1 - Prob. 10.1CPCh. 10.1 - Prob. 10.2CPCh. 10.1 - Prob. 10.3CPCh. 10.1 - Prob. 10.4CPCh. 10.1 - Prob. 10.5CPCh. 10.1 - Prob. 10.6CPCh. 10.1 - Prob. 10.7CPCh. 10.1 - Prob. 10.8CPCh. 10.1 - Prob. 10.9CPCh. 10.1 - When does the code in a finally block execute?
Ch. 10.1 - What is the call stack? What is a stack trace?Ch. 10.1 - Prob. 10.12CPCh. 10.1 - Prob. 10.13CPCh. 10.1 - Prob. 10.14CPCh. 10.2 - What does the throw statement do?Ch. 10.2 - Prob. 10.16CPCh. 10.2 - Prob. 10.17CPCh. 10.2 - Prob. 10.18CPCh. 10.2 - Prob. 10.19CPCh. 10.3 - What is the difference between a text file and a...Ch. 10.3 - What classes do you use to write output to a...Ch. 10.3 - Prob. 10.22CPCh. 10.3 - What class do you use to work with random access...Ch. 10.3 - What are the two modes that a random access file...Ch. 10.3 - Prob. 10.25CPCh. 10 - Prob. 1MCCh. 10 - Prob. 2MCCh. 10 - Prob. 3MCCh. 10 - Prob. 4MCCh. 10 - FileNotFoundException inherits from __________. a....Ch. 10 - Prob. 6MCCh. 10 - Prob. 7MCCh. 10 - Prob. 8MCCh. 10 - Prob. 9MCCh. 10 - Prob. 10MCCh. 10 - Prob. 11MCCh. 10 - Prob. 12MCCh. 10 - Prob. 13MCCh. 10 - Prob. 14MCCh. 10 - Prob. 15MCCh. 10 - This is the process of converting an object to a...Ch. 10 - Prob. 17TFCh. 10 - Prob. 18TFCh. 10 - Prob. 19TFCh. 10 - True or False: You cannot have more than one catch...Ch. 10 - Prob. 21TFCh. 10 - Prob. 22TFCh. 10 - Prob. 23TFCh. 10 - Prob. 24TFCh. 10 - Find the error in each of the following code...Ch. 10 - // Assume inputFile references a Scanner object,...Ch. 10 - Prob. 3FTECh. 10 - Prob. 1AWCh. 10 - Prob. 2AWCh. 10 - Prob. 3AWCh. 10 - Prob. 4AWCh. 10 - Prob. 5AWCh. 10 - Prob. 6AWCh. 10 - The method getValueFromFile is public and returns...Ch. 10 - Prob. 8AWCh. 10 - Write a statement that creates an object that can...Ch. 10 - Assume that the reference variable r refers to a...Ch. 10 - Prob. 1SACh. 10 - Prob. 2SACh. 10 - Prob. 3SACh. 10 - Prob. 4SACh. 10 - Prob. 5SACh. 10 - Prob. 6SACh. 10 - What types of objects can be thrown?Ch. 10 - Prob. 8SACh. 10 - Prob. 9SACh. 10 - Prob. 10SACh. 10 - What is the difference between a text file and a...Ch. 10 - What is the difference between a sequential access...Ch. 10 - What happens when you serialize an object? What...Ch. 10 - TestScores Class Write a class named TestScores....Ch. 10 - Prob. 2PCCh. 10 - Prob. 3PCCh. 10 - Prob. 4PCCh. 10 - Prob. 5PCCh. 10 - FileArray Class Design a class that has a static...Ch. 10 - File Encryption Filter File encryption is the...Ch. 10 - File Decryption Filter Write a program that...Ch. 10 - TestScores Modification for Serialization Modify...Ch. 10 - Prob. 11PC
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
A(n) _________ is a key word inside a class declaration that establishes a members accessibility.
Starting Out with C++ from Control Structures to Objects (9th Edition)
Describe two properties that each candidate key must satisfy.
Modern Database Management
Suppose a small company has five employees and is planning to increase the number to six. Moreover, suppose one...
Computer Science: An Overview (12th Edition)
What is the output of the following?
Absolute Java (6th Edition)
Where do you declare class-level variables?
Starting Out With Visual Basic (7th Edition)
// This code contains ERRORS! // It adds two numbers entered by the user. int1 num1, num2; String input; char a...
Starting Out with Java: From Control Structures through Data Structures (3rd Edition)
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
- Computer Science JAVASCRIPT .xlsx parser I need to write a public class that reads an .xlsx file and returns an array of data in javascript. The array would be all of the data inside of the file. The file itself is going to be inside of a folder(downloadedFIles) inside of my project. So the public class will need to account for that.arrow_forwardCODE IN JAVA Write a class name FileDisplay with the following methods: Constructor: takes the name of a file as an argument displayHead: displays only the first five lines of the file’s contents. If the file contains less than 5 lines, it should display the file’s entire contents. displayContents: displays the entire contents of the file, the name of which was passed to the constructor.writeNew: displays the contents of a file, the name of which was passed to the constructor. Each line should be preceded with a line number followed by a colon. The line numbering should start at 1. As each line is displayed it should also be written to a new file, the name of which is passed in as a parameter. I have provided a test file called “testfile.txt”. I have also provided a driver for the application called “filedisplaytest.java”. This file is complete and should not be altered. FILEDISPLAYTEST.JAVA (do not change this) import java.io.*; public class FileDisplayTest {…arrow_forwardC++ Progrmaing Instructions Redo Programming Exercise 6 of Chapter 8 using dynamic arrays. The instructions have been posted for your convenience. The history teacher at your school needs help in grading a True/False test. The students’ IDs and test answers are stored in a file. The first entry in the file contains answers to the test in the form: TFFTFFTTTTFFTFTFTFTT Every other entry in the file is the student ID, followed by a blank, followed by the student’s responses. For example, the entry: ABC54301 TFTFTFTT TFTFTFFTTFT indicates that the student ID is ABC54301 and the answer to question 1 is True, the answer to question 2 is False, and so on. This student did not answer question 9 (note the empty space). The exam has 20 questions, and the class has more than 150 students. Each correct answer is awarded two points, each wrong answer gets one point deducted, and no answer gets zero points. Write a program that processes the test data. The output should be the student’s ID,…arrow_forward
- Java Problem The teacher at a school needs help grading an exam with a number of True/False questions. The students’ IDs and test answers are stored in a file. The first entry of the file contains the answer to the test in the form: TTFTFTTTFTFTFFTTFTTF Every other entry in the file is the student’s ID, followed by a blank, followed by the students’ response. For instance, the entry: ABC54102 T FTFTFTTTFTTFTTF TF The student’s ID is ABC54102, answer to question 1 is True, the answer to question 3 is False. Also, the student did not answer question 2 and question 18. The exam has 20 questions. Here is the grading policy: each correct answer is awarded two points, each wrong answer get -1 point, and no answer gets 0 point. Write a program that processes the test data. The output should be the student’s ID, followed by the answers, followed by the test score (total points), followed by the test grade. Assume the following grade scale will be used: 90%-100%, A; 80%-89.99%, B; 70%-79.99%,…arrow_forwardfile operator code 1 // The FileOperator class that includes methods for file input and output 2 // Maham Hameed 3 import java.io.*; 4 public class FileOperator 5 { 6 // instance variables 7 private File m_file; 8 9 // constructor 10 // Do not make any changes to this method! 11 public FileOperator() 12 { 13 String fileName = "employeeData.txt"; 14 m_file = new File(fileName); 15 } 16 17 // This method writes an array of Employees into a physical file. 18 // Each line is in this format: "S-Optimus Prime-Computer Science-$1200" 19 // "S" represents StudentWorker ("F" represents Faculty) 20 public void writeFile(Employee[] employees) 21 { 22 // TODO: implement this method 23 } 24 }arrow_forwardPlease create a Java class that has the following data attributes and methods: private int count - number of customers in the array private customer Record[] data - array of customerRecord objects public customer List() constructor that should initialize memory for data array and count value public void getCustomerList(String fileName) - reads a file call fileName which is a text file containing lines (records) of customer data. This method fills the data array with the records from the file. The file will not have more than 100 records and will have the following format (where customer Number is an integer, firstName and lastName are Strings, and balance is a float: customerNumber firstName lastName balance public customerRecord getCustomer(int customerNumber) - returns the object corresponding to the customer with customerNumber. If the customer number is not in the array, return null. public void enter CustomerRecord(customerRecord new_record)…arrow_forward
- Create a class Student that contains three members: roll no, name and mark, and threefunctions. Write a first inputStudent() function to get data of student class. Write a secondgetMark() function that returns a student’s mark. Write a third display() function thatdisplays a student’s data. In a main() function, you need to declare 40 students and get dataof all students by using inputStudent() function. And also use a pointer array to keep allstudents by mark greater than 50 and display the searching data of each student in thatpointer array (Use the access operator -> to access a pointer points to member functions ofthe Student class)arrow_forwardAssignment Pointers & Classes1- Define a class student with the following fields:a. First nameb. Last namec. IDd. Number of courses enrolled ine. Dynamic array of courses (taken and currently enrolled in): String *coursesf. Dynamic array of grades: int* gradesg. Addressh. Registration feesi. Total number of creditsj. Expected Graduation term.2- Declare an array of four students. Perform the following operations using your declared array:a. Open the provided file input.txt. Fill the array by reading values from the specified inputfile. Make sure that the array of courses and array of grades are initialized properly anddestroyed properly as well.b. Call a function that prints student information in a well-organized table like fashion.c. Call a function that compares average between two students.d. Call a function that prints student names based on their GPA from highest to lowest.(hint you need to sort the array of students).e. Call a function that prints student names from lowest…arrow_forwardCLASSES, DYNAMIC ARRAYS AND POINTERS Define a class called textLines that will be used to store a list of lines of text (each line can be specified as a string). Use a dynamic array to store the list. In addition, you should have a private data member that specifies the length of the list. Create a constructor that takes a file name as parameter, and fills up the list with lines from the file. Make sure that you set the dynamic array to expand large enough to hold all the lines from the file. Also, create a constructor that takes an integer parameter that sets the size of an empty list. in C++ Write member functions to: remove and return the last line from the list add a new line onto the end of the list, if there is room for it, otherwise print a message and expand the array empty the entire list return the number of lines still on the list take two lists and return one combined list (with no duplicates) copy constructor to support deep copying remember the destructor!arrow_forward
- void Pokedex::wakeupProfessorJimi(std::string) − populates the dynamic array of Entries with data from a valid file path, the function should open the file and use the add (Pokemon*, int) function to insert a Pok ́emon into the correct position in the dynamic array of Entries. Once the position is determined, the Pok ́emon should be inserted into the corresponding position in the list of Pok ́emon belonging to the Entries object. i aready have a pokemon class with enum for types, move class and move class setup and working it's just this one part. here is the text file 1,Bulbasaur,45,49,[Grass,Poison],Fire,Water,[[tackle,40,40,100],[vine whip,45,45,100],[growl,10,10,100]] 2,Ivysaur,60,63,[Grass,Poison],Fire,Water,[[leech seed,45,45,90],[razor leaf,55,55,95],[growl,10,10,100]] 3,Venusaur,80,83,[Grass,Poison],Fire,Water,[[tackle,40,40,100],[leech seed,45,45,90],[razor leaf,55,55,95],[growl,10,10,100]] 4,Charmander,39,43,[Fire],Water,Fire,[[growl,10,10,100],[fire fang,65,65,95]]…arrow_forwardjava languageCreate a new main fileCreate an array of size 3. The array must be of class mammal.Create an object of each class.(feline, domestic)Assign values to each of the created objects.Assign each of the objects to each of the positions in the array.Using a loop, it displays each of the positions in the array.arrow_forwardfile operator code 1 // The FileOperator class that includes methods for file input and output 2 // Your name 3 import java.io.*; 4 public class FileOperator 5 { 6 // instance variables 7 private File m_file; 8 9 // constructor 10 // Do not make any changes to this method! 11 public FileOperator() 12 { 13 String fileName = "employeeData.txt"; 14 m_file = new File(fileName); 15 } 16 17 // This method writes an array of Employees into a physical file. 18 // Each line is in this format: "S-Optimus Prime-Computer Science-$1200" 19 // "S" represents StudentWorker ("F" represents Faculty) 20 public void writeFile(Employee[] employees) 21 { 22 // TODO: implement this method 23 } 24 }arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill Education
Starting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSON
Digital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON
C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSON
Database Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage Learning
Programmable 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
Memory Management Tutorial in Java | Java Stack vs Heap | Java Training | Edureka; Author: edureka!;https://www.youtube.com/watch?v=fM8yj93X80s;License: Standard YouTube License, CC-BY