Deck 1: Introduction

Question 1

Comments should

A) rephrase the code it explains in English
B) be insightful and explain what the instruction's intention is
C) only be included in code that is difficult to understand
D) be used to define variables whose names are not easy to understand
E) all of the above

Answer 1

B
Explanation: B) One might answer E, but that then includes A and C, making "all of the above" incorrect. Comments should not rephrase in English what an instruction says, but instead should explain what that instruction is doing in relation to the program. Introductory programmers often have difficult explaining their code and wind up stating the obvious in their comments. While answer D is partially correct, it is not entirely True all variables should have comments that explain their use.

Question 2

For a computer to communicate over the Internet, it must use

A) the TCP protocol
B) the IP protocol
C) the combined TCP/IP protocol
D) the Ethernet protocol
E) the ARPANET protocol

Answer 2

C
Explanation: C) IP is the Internet Protocol, but the TCP (Transmission Control Protocol) also must be used because it handles such problems as how to piece together packets of the same message that arrive out of order. Ethernet is a LAN protocol, which might be used in addition to TCP/IP in some networks, but it is not needed to communicate over the Internet. There is no such thing as the ARPANET protocol.

Question 3

The ability to directly obtain a stored item by referencing its address is known as

A) random access
B) sequential access
C) read-only access
D) fetch access
E) volatility

Answer 3

A
Explanation: A) Random access is meant to convey the idea that accessing any item is equally easy, and that any item is retrievable based solely on its address. Random access is the form of access used by both RAM and ROM memory. Disk access, called direct access, is a similar idea, and direct and random access are sometimes referred to synonymously. Sequential access is used by tape.

Question 4

Binary numbers are composed entirely of

A) 0s
B) 1s
C) 0s and 1s
D) 0s, 1s and 2s
E) any digits between 0 and 9

Question 5

It is important to dissect a problem into manageable pieces before trying to solve the problem because

A) most problems are too complex to be solved as a single, large activity
B) most problems are solved by multiple people and it is easy to assign each piece to a separate person
C) it is easier to integrate small pieces of a program into one program than it is to integrate one big chunk of code into one program
D) our first solution may not solve the problem correctly
E) all of the above

Question 6

A URL (Universal Resource Locator) specifies the address of

A) a computer on any network
B) a computer on the Internet
C) a local area network (LAN) on the Internet
D) a document or other type of file on the Internet
E) a Java program on the Internet

Question 7

Which phase of the fetch-decode-execute cycle might use a circuit in the arithmetic-logic unit?

A) fetch
B) decode
C) execute
D) during fetch or execute, but not decode
E) could be used in fetch, decode or execute phase

Question 8

Which memory capacity is the largest?

A) 1,500,000,000,000 bytes
B) 100 gigabytes
C) 3,500,000 kilobytes
D) 10 terabyte
E) 12,000,000 megabytes

Question 9

The main method for a Java program is defined by

A) public static main( )
B) public static main(String[ ] args);
C) public static main(String[ ] args)
D) private static main(String[ ] args)
E) the main method could be defined as in A, C or D but not B

Question 10

The instruction: System.out.println("Hello World"); might best be commented as

A) // prints "Hello World" to the screen
B) // prints a message
C) // used to demonstrate an output message
D) //
E) // meaningless instruction

Question 11

Java is an example of a(n)

A) machine language
B) assembly language
C) high-level language
D) fourth generation language
E) both C and D

Question 12

Which character below is not allowed in an identifier?

A) $
B) _
C) 0 (zero)
D) q
E) ^

Question 13

In order for a computer to be accessible over a computer network, the computer needs its own

A) MODEM
B) communication line
C) network address
D) packet
E) router

Question 14

6 bits can be used to represent ________ distinct items or values

A) 6
B) 20
C) 24
D) 32
E) 64

Question 15

Once we have implemented the solution, we are not done with the problem because

A) the solution may not be the best (most efficient)
B) the solution may have errors and need testing and fixing before we are done
C) the solution may, at a later date, need revising to handle new specifications
D) the solution may, at a later date, need revising because of new programming language features
E) all of the above

Question 16

The line of Java code "// System.out.println("Hello");" will

A) do nothing
B) cause "Hello" to be output
C) cause a syntax error
D) cause "(Hello)" to be output
E) there is no way to know without executing this line of code

Question 17

When executing a program, the processor reads each program instruction from

A) secondary memory (storage)
B) the Internet
C) registers stored in the processor
D) main memory
E) could be any of these

Question 18

In the following list, which statement is not True regarding Java as a programming language?

A) It is a relatively recent language, having been introduced in 1995
B) It is a language whose programs do not require translating into machine language before they are executed
C) It is an object-oriented programming language
D) It is a language that embraces the idea of writing programs to be executed using the World Wide Web
E) All of the above are True

Question 19

Volatility is a property of

A) RAM
B) ROM
C) disk
D) software
E) computer networks

Question 20

A Java program is best classified as

A) hardware
B) software
C) storage
D) processor
E) input

Question 21

Java is an object-oriented programming language.

Question 22

The Java compiler is able to find all programmer errors.

Question 23

Which of the following is a legal Java identifier?

A) 1ForAll
B) oneForAll
C) one/4/all
D) 1_4_all
E) 1forall

Question 24

A color image is broken down into individual pixels (points), each of which is represented by

A) a 1 for white and a 0 for black
B) 3 values denoting the intensity of red, green, and blue in the image
C) a single number indicating the intensity of color between white and black
D) two numbers, a value that denotes where between white and black the color is, and a brightness
E) none of the above, it is not possible to represent a color image

Question 25

All information is stored in the computer using binary numbers.

Question 26

A unique aspect of Java that allows code compiled on one machine to be executed on a machine of a different hardware platform is Java's

A) bytecodes
B) syntax
C) use of objects
D) use of exception handling
E) all of the above

Question 27

Following Java naming convention, which of the following would be the best name for a class about store customers?

A) StoreCustomer
B) Store Customer
C) storeCustomer
D) STORE_CUSTOMER
E) Store-Customer

Question 28

Which of the following characters does not need to have an associated "closing" character in a Java program?

A) {
B) (
C) [
D) <
E) all of these require closing characters

Question 29

The word "Public" is a reserved word.

Question 30

Java byte codes are directly executable whereas Java source code is not.

Question 31

Which of the following is a legal Java identifier?

A) i
B) class
C) ilikeclass!
D) idon'tlikeclass
E) i-like-class

Question 32

Which of the following would be a good variable name for the current value of a stock?

A) curstoval
B) theCurrentValueOfThisStockIs
C) currentStockVal
D) csv
E) current

Question 33

Which of the following is True regarding Java syntax and semantics?

A) a Java compiler can determine if you have followed proper syntax but not proper semantics
B) a Java compiler can determine if you have followed proper semantics but not proper syntax
C) a Java compiler can determine if you have followed both proper syntax and semantics
D) a Java compiler cannot determine if you have followed either proper syntax or semantics
E) a Java compiler can determine if you have followed proper syntax and can determine if you have followed proper semantics if you follow the Java naming convention rules

Question 34

Code placed inside of comments will not be compiled and therefore will not execute.

Question 35

Mistyping "println" as "printn" will result in

A) a syntax error
B) a run-time error
C) a logical error
D) no error at all
E) converting the statement into a comment

Question 36

Java is a case-sensitive language meaning that Current, current and CURRENT will all reference the same identifier.

Question 37

System.out.print is used in a program to denote that a documentation comment follows.

Question 38

An error in a program that results in the program outputting $100 instead of the correct answer, $250 is

A) a programmer error
B) a syntax error
C) a run-time error
D) a logical error
E) a snafu

Question 39

Java is similar in syntax to what other high level language?

A) Pascal
B) Ada
C) C++
D) FORTRAN
E) BASIC

Question 40

Which of the following is not syntactically legal in Java?

A) public class Foo
B) System.out.println("Hi");
C) { }
D) s t a t i c main(String[ ] args)
E) only B is legally valid, all of the rest are illegal

Question 41

In a Java program, dividing by 0 is a syntax error.

Question 42

What is the output of the following when the main method is executed?
public class Question4
{
public static void main(String[ ] args)
{
System.out.println("hi there");
System.out.println(" ");
System.out.println("how are you doing today?
");
}
}

Question 43

What is wrong with the following class definition?
public class Program2
public static void main(String[ ] args)
{
System.out.println("My second Java program");
}

Question 44

Provide a brief explanation of the role of main memory, the control unit, the arithmetic logic unit, and registers. (see figure 1.13)

Question 45

There are a number of reserved words in Java that have no current meaning (denoted with an * in figure 1.18). Why?

Question 46

Polymorphism is the idea that we can refer to multiple types of related objects in consistent ways.

Question 47

A document of text is 15 pages long. Each page contains approximately 200 words and the average length of each word is 5 characters. Also assume one blank space between each word and no punctuation. How many bytes will it take to store this document in memory or on disk using ASCII?

Question 48

In Java, identifiers may be of any length up to a limit determined by the compiler.

Question 49

During translation, the compiler puts its output (the compiled Java program) into ROM.

Question 50

What is wrong with the following println statement?
System.out.println("My fourth Java Program);

Question 51

Provide a brief description of the roles of the following hardware elements (that is, what each is used for):
a) CPU
b) Main memory
c) Secondary memory devices
d) Input/Output devices

Question 52

Objects are defined by a class that describes the characteristics common to all instances of the class.

Question 53

Rewrite the following program with better formatting to make it easier to read.
public
class
MyProgram
{ public static void
main(
String[ ]
args)
{ System.out.println(
"Wow, this is messed up!"
);
} }

Question 54

Rewrite the following comment so that it can appear over multiple lines.
// This is one really enormously long comment that might run off the page

Question 55

Reserved words in Java can be redefined by the programmer to mean something other than their original intentions.

Question 56

Inheritance is a form of software reuse.

Question 57

Provide identifier names that would be used to represent a person's social security number, income tax withheld, and net pay.

Question 58

Given the following class definition, what are the reserved words and what are the identifiers?
public class Program3
{
public static void main(String[ ] args)
{
System.out.println("My third Java program");
}
}

Question 59

What is wrong with the following class definition?
public class Program1
{
public static void main(String[ ] args)
{
System.out.println("My first Java program")
}
}

Question 60

Examine figure 1.7 before answering this question. What 8-bit value comes immediately before and what 8-bit value comes immediately after 10010111?

Question 61

Considering that the Pentium IV processor runs at a clock speed of about 850 MHz. What clock speed might we expect from a Pentium chip that would be released in 3 years?

Question 62

Correct all the syntax errors in the following program.
Public Class Program \\ A problem program
(
Public static voided main[Strings( ) args]
{
system.out.println('This program'); \* oh, my... *\
system.out.println('has several syntax errors'); \* lots of errors *\
}
)

Question 63

Write a Java program that will display the following three lines when it is run:
*
* * *
* * * * *

Question 64

Name five of the fundamental terms which encompass object-oriented programming.

Question 65

Write a Java program that will output on two separate lines the names of the authors of this textbook.