Release Date:!4/12/1434 H (Wed 9/10/2013) Due Date:!! 18/12/1434 H (Wed 23/10/2013)

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1 King Saud University College of Computer & Information Sciences Computer Science Department CSC 111 sections 31209, Homework 2 Release Date:!4/12/1434 H (Wed 9/10/2013) Due Date:!! 18/12/1434 H (Wed 23/10/2013) Important notes: - Clearly write your name and student ID on the answer paper or file, EVEN if you wrote it in your submission. - ALL answers must be made using a text editor (e.g MS-Word). Hand written answers will not be accepted. - Do NOT repeat the questions in your answers. Only submit the answers. - Submit the homework on or before the due date. - For printed copies, put them in the box by my office door or submit them in the class. - For soft copies, send them as an attachment to my using the LMS website with the words CSC111 homework 1 in the title (in English). Make ALL answers in ONE file. The accepted file formats are: Text, MS-word, and PDF. Answer the following questions: Q1. True/False # Question Answer 1 A class is a homogeneous structured data type. T 2 The members of a class can be of any type except float. F 3 It is not allowed for different class to have identical member names. T 4 To select a member of a class, you specify the member name, then a dot, and then the class variable name. 5 The terms class object and class member mean the same thing. T T 1

2 # Question Answer 6 Clients of a Java class can access the public and private members directly. F Q2. Multiple Choice (pick the smallest set of choices that covers all correct answers. So, your set of choice for the multi-choice questions can be: 1:{a, b, 2:{c, 3:{,... etc. For example, in one question, if you think the choice a is correct, the choice b is correct, and there is a choice c that states that a and b are correct, then choose the smallest set, which is {c.) 1. A class is an example of: a. a simple data type b. a homogeneous structured type c. a heterogeneous structured type d. an enumeration type 2. Which line of the following program fragment contains a syntax error? public class StatType {! public float height;! public int weight; Stat Type stats; a. line 1 b. line 2 c. line 3 d. line 4 e. line 5 3. Given the declaration public class PersonRec {! public int age;! public float height;! public int weight; which of the following is valid for creating and initializing a PersonRec variable? a. PersonRec me = new Person();! me.age = 19;! me.height = 66.5;! me. weight = 140; b. PersonRec me = {19, 66.5, 140; c. PersonRec.age = 19;! PersonRec.height = 66.5; 2

3 ! PersonRec. weight = 140; d. a and b above e. a, b, and c above 4. Given the declarations public class RecTypel {! public int length;! public float width; public class RecType2 {! public int length;! public float width; RecTypel myrec = new RecTypel(); RecType2 yourrec = new RecType2() ; which of the following assignment statements is valid? a. myrec.length = yourrec.length; b. myrec = yourrec; c. myrec.length = yourrec; d. a and b above e. none of the above 5. Consider the class declaration public class SomeClass {! public int m;! public int n; SomeClass alpha = new SomeClass(); SomeClass beta = new SomeClass(); Considering both pieces of code above, which identifiers are names of class members? a. m and n b. alpha and beta c. SomeClass, m, and n d. alpha, beta, m, and n 6. Which line of the following class declaration contains a syntax error? public class SomeClass! public long x,y;! public string name;! public int n; a. line 1 b. line 2 c. line 3 d. line 4 3

4 e. line 5 7. Suppose that myprog.java is a client of two classes: Classl.java and Class2.java. If only myprog.java is modified, which file(s) must be recompiled? a. myprog.java b. Classl.java c. Class2.java d. all of a, b, and c above e. none of a, b, and c above 8. Assume that myclass.java is a file for a class MyClass and that someprog.java is a client of class MyClass. The two files are in different packages. Which file(s) must import the needed class? a. someprog.java b. myclass.java c. a and b above Q3. Fill-In 1. A(n) attribute name. is a structured data type whose components, which may be of different data types, are accessed by name. 2. The expression used to access a component of a class variable is called a(n) modifier.. 3. The java terminology for "field of a class" is member variable.. Q4. Programming 1. Given the declarations public class BookType {! public String BookType;! public String publisher;! public String title;! public String author; write a statement to print the information of a book. 2. Given the declarations public class DateType {! public int month;! public int day;! public int year; public class EmployeeType { 4

5 ! public String lastname,firstname, department;! public int salary; public DateType employmentdate; ; EmployeeType boss; a. Give the most appropriate class structure with which to represent the following: a person's name, work and home numbers, and work and home addresses. b. Write a statement to print the year in which the boss was hired. 5

6 4/ public class BookType { public String BookType; public String publisher; public String title; public String author; Public class Book { Public static void main(string[ ] args){ BookType p = new BookType (); p.booktype = new String ( health ); p.publisher = new String ( the sun ); p.title = new String ( how to lose weight ); p.author = new String ( ahmed ); System.out.println( Book tybe is + p.booktype); System.out.println( The publisher is + p.publisher); System.out.println( The title is + p.title); System.out.println( The author is + p.author); 5/ (A) Public class Person{ Public String name; Public String work; Public int homenumber; Public String homeadresses; / 5 (B) Public class boss{ Public int Public class test{ yearofhiring; Public static void main(string[ ] args){ boss p = new boss (); p. yearofhiring =3991 ; System.out.println(p. yearofhiring); 6

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Give one example where you might wish to use a three dimensional array

Give one example where you might wish to use a three dimensional array CS 110: INTRODUCTION TO COMPUTER SCIENCE SAMPLE TEST 3 TIME ALLOWED: 60 MINUTES Student s Name: MAXIMUM MARK 100 NOTE: Unless otherwise stated, the questions are with reference to the Java Programming