Midterm

Logical errors are mistakes that cause the program to produce erroneous results.

True

Application software refers to programs that make the computer useful to the user

True

Java files end with the .class extension

False

A procedure is a set of programming language statements that, together, perform a specific task.

True

Without programmers, the users of computers would have no software, and without software, computers would not be able to do anything.

True

The contents of a variable cannot be changed while the program is running.

False

RAM is usually\______

A volatile types of memory, used for temporary storage

The two primary methods of programming in use today are\_____

Procedural and Object oriented

Software refers to \____

programs

Variables are

Symbolic names made up by the programmer that represents locations in the computer's RAM

\_____ refers to the physical components that a computer is made of

Hardware

A cross between human language and programming language is called \_____

Pseudocode

Key words are\____

Words that have a special meaning in the programming language

Application software refers to \_____

programs that make the computer useful to the user

What is a syntax?

Rules that must be followed when writing a program

The CPU (Central Processing Unit) consists of two parts which are \_____

The Control Unit and the Logic Unit

There are \____ bits in a byte

8

Java was developed by \_____

Sun Microsystems

Which of the following will compile a program called ReadIt

java ReadIt.javac
javac ReadIt.javac
javac ReadIt.java
java ReadIt.java

javac ReadIt.java

Which of the following will run the compiled program called ReadIt

run ReadIt
java ReadIt
go ReadIt
java ReadIt.java

java ReadIt

Both characters and string literals can be assigned to a char variable

false

A variable's scope is the part of the program that has access to the variable.

True

Named constants are initialized with a value, that value cannot be changed during the execution of the program.

True

The Java API provides a class method named Math that contains numerous methods which are useful for performing complex mathematical operations

True

Java is not case sensitive.

False

A program must have at least one of the following

A class definition

Which of the following would contain the translated java byte code for a program named Demo

Demo.byte
Demo.java
Demo.code
Demo.class

Demo.class

Which of the following is a named storage location in the computers memory

a literal
a variable
a constant
an operator

A variable

To compile a program named First you would use which of the following commands?

compile First.java
javac First.java
java First.java
javac First

javac First.java

Which of the following is not a rule that must be followed when naming identifiers

The 1st character must be one of the letters A/a-Z/z, underscore, or a $
Identifiers can contain spaces
Upper/lowercase characters are distinct
After the 1st character, you can use the letters A/a-Z/z, underscore, 0-9, or a $

Identifiers can contain spaces

Characters literals are enclosed in \____ and string literals are enclosed in \_____

single quotes and double quotes

What is the result of the following expression
17 % 3 * 2 - 12 + 15

7

What is the value of z after the following statements have been executed?
int x \= 4, y \= 33;
double z;
z \= (double) (y / x);

8.0

Which of the following statements is invalid

double r \= 2.9X106
double r \= 9.4632E15
double r \= 326.75
double r \= 9.4632e15

double r \= 2.9X106

What will be displayed as a result of executing the following code?

Final int \= 22, y \= 4;
y +\= x;
System.out.println("x \= " + x + ", y \= " + y)

Nothing, there is an error in the code

Which of the following correctly creates a Scanner object for keyboard input

Scanner keyboard \= new Scanner(System.in);
Keyboard scanner \= new Keyboard(System.in);
Scanner kbd \= new Scanner(System.keyboard);
Scanner keyboard(System.in);

Scanner keyboard \= new Scnnaer(System.in);

The primitive data types only allow a(n) \________ to hold a single value.

Variable

When the + operator is used with strings, it is known as the

string concatenation operator

What would be printed out as a result of the following code?

System.out.println ("the quick brown fox" + "jumped over the \n" "slow moving hen.");

Nothing, there is an error

Which of the following is valid?

float y;
double z;
z \= 934.21;
y \= z;

float w;
w \= 1.0f;

float y;
y \= 54.9;

float v;
v \= 1.0

float w;
w \= 1.0f;

In an if-else statement, if the boolean expression is false then

The statement or block following the else is executed

\______ operators are used to determine whether a specific relationship exists between two values

relational

If str1 and str2 are both String object, which of the following expressions will correctly determine whether or not they are equal

str1 +\= str2

str1 \= str2

str1.equals(str2)

str1 && str2

str1.equals(str2)

A block of code in enclosed in a set of

braces

A flag may have the values

True or False

What will the values of ans ,x, and y be after the following statements are executed

int ans\=35, x \= 50, y \= 50;
if (X\>\=Y)
{
ans \= x + 10;
x -\= y;
}
else
{
ans \= y + 10;
y +\= x;
}

ans \= 60, x \= 0, y \= 50

What will the value of x be after the following statements are executed

int x \= 75;
int y \= 60;
if (x\>y)
x \= x-y

15

What will the value of x be after the following statements execute?

int x \= 10;
switch (x)
{
case 10:
x +\= 15;
case 12:
x -\= 5;
break;
default:
x +\= 3

20

Which of the following determines whether the char variable, CharA, is not equal to the letter 'A'

chrA !\= 'A'

chrA\== 'A'

chrA.notEquals(A)

chrA || 'A'

chrA !\= 'A'

In Java, when a character is stored in memory, it is actually the \______ that is stored

unicode

Java requires that the boolean expression being tested by an if statement be enclosed in \______

A set of parentheses

Which of the following statements determines whether the variable temp is within the range of 0-100 (inclusive)

if (temp \> 0 || temp < 100)

if (temp \> 0 && temp < 100)

if (temp \>\= 0 && temp \=< 100)

if (temp \>\= 0 || temp \=< 100)

if (temp \>\= 0 && temp \=< 100)

\________ works like this, If the expression on the left side of the && operator is false, the expression on the right side will not be checked

Short-circuit evaluation

What will be printed when the following code is executed?
double x \= 45678.259;
System.out.printf("%, .2f", x);

45,678.26

All it takes for an OR expression to be true is for one of the subexpressions to be true.

True

When testing for character values, the Switch statement does not test for the case of the character

False

Unicode is an international encoding system that is extensive enough to represent all the characters of all the world's alphabets.

True

A local variables scope always ends at the closing brace of the block of code in which it is declared

True

In a switch statement, each of the case values must be unique

True

The system.out.printf method formats a string and displays it in the console window

True

Which part of the computer fetches instructions, carries out the operations commanded by the instructions, and produces some outcome or resultant information?

CPU

A byte is made up of eight

bits

Each byte is assigned a unique

address

This type of memory can hold data for long periods of time—even when there is no power to the computer.

Secondary Storage

If you were to look at a machine language program, you would see .

a stream of binary numbers

These are words that have a special meaning in the programming language.

key words

These are symbols or words that perform operations on one or more operands.

Operators

These characters serve specific purposes, such as marking the beginning or ending of a statement, or separating items in a list.

punctuation

These are words or names that are used to identify storage locations in memory and parts of the program that are created by the programmer.

Programmer defined names

These are the rules that must be followed when writing a program.

Syntax

The named storage location in the computer memory

Variable

The java compiler generates

byte code

JVM stands for

Java Virtual Machine

Every complete statement ends with a

semicolon

The following data are examples of what

72
'A'
"Hello World"
2.8712

literals

A group of statements, such as the contents of a class or a method, are enclosed in

Braces

Which of the following are not valid assignment statements? (Indicate all that apply.)
total \= 9;
72 \= amount;
profit \= 129
letter \= 'W';

72 \= amount, numbers cannot be first

Which of the following are not valid println statements? (Indicate all that apply.)

System.out.println + "Hello World";

System.out.println("Have a nice day");

out.System.println(value);

println.out(Programming is great fun);

1,3,4

the negation operator is

unary

This keyword is used to declare a named constant

final

These character mark the beginning of a multiline comment

/*

These character mark the beginning of a single line comment

//

These character mark the beginning of a documentation comment

/**

Which Scanner class method would you use to read a string as input?

nextLine

Which Scanner class method would you use to read a double as input?

nextDouble

You can use this class to display dialog boxes.

JOptionPane

When Java converts a lower-ranked value to a higher-ranked type, it is called a(n) .

widening conversion

This type of operator lets you manually convert a value, even if it means that a narrowing conversion will take place.

cast

A left brace in a Java program is always followed by a right brace later in the program.

True

A variable must be declared before it can be used.

True

Variable names may begin with a number.

False

Comments that begin with // can be processed by javadoc.

False

If one of an operator's operands is a double, and the other operand is an int, Java will automatically convert the value of the double to an int.

false

What will the println statement in the following program segment display?

int x \= 5; System.out.println(x++);

5

What will the println statement in the following program segment display?

int x \= 5; System.out.println(++x);

6

In the expression number++, the ++ operator is in what mode?

postfix

What is each repetition of a loop known as?

iteration

This is a variable that controls the number of iterations performed by a loop.

loop control variable

The while loop is this type of loop.

pretest

The do-while loop is this type of loop.

posttest