Deck 2: Programming Building Blocks- Java Basics

Question 1

There are __________ bytes in a long integer data type.

Answer 1

8

Question 2

User-defined words in Java:

A) are used as identifiers.
B) consist of keywords used in Java instruction.
C) are not case-sensitive.
D) include two special data values, true and false.

Answer 2

A

Question 3

Blocks are required for class and concrete method definitions. They consist of 0, 1, or more statements, start with a left curly brace, and end with a right curly brace.

Answer 3

True

Question 4

Any of Java's reserved words can be used as identifiers.

Question 5

Which of the following is a primitive data type in Java?

A) Byte
B) Float
C) Char
D) All of these are correct.

Question 6

Which of the following is not true about assigning values?

A) Assigning a value is optional when the constant is defined.
B) You must assign a value before the constant is used in a program.
C) A constant's value can be reassigned three times or fewer in a program.
D) Attempting to change the value of a constant will generate a compiler error.

Question 7

Variables need to be declared twice so they can be used in your program: once at the beginning and then at the end of the program.

Question 8

Because Unicode characters are encoded as unsigned numbers using 16 bits, a char variable is stored in two bytes of memory.

Question 9

What is operator precedence?

A) A set of rules to determine the order in which the operations should be performed
B) Operands used to perform a function
C) A variable or a constant having a data type compatible with the value of the expression
D) A system that recognizes the importance of the programmer in designing the operands

Question 10

Division with two integer operands is performed in the Arithmetic Logic Unit (ALU), which can only calculate an integer result.

Question 11

It is legal to assign a float value to a double. Which of these statement pairs is not valid?

A) float salesTax = .05f;
B) double taxRate = .05;
C) float salesTax = taxRate;
D) double taxRate = salesTax;

Question 12

How can you create a String literal that includes a newline character?

A) Java provides a set of escape sequences that can be used to include a special character within String and char literals.
B) Declare the variables before you use them.
C) Use the + operator.
D) Use /*.

Question 13

If you specify that a data item is a double (a double-precision floating-point number), then the compiler will allocate 16 bytes of memory and store its value as an IEEE 754 floating-point number.

Question 14

The arithmetic operation 7x + 2y can be written without using parentheses.

Question 15

A boolean data type can hold only one value: true.

Question 16

Java is case-sensitive, so although True is a reserved word, true is not.

Question 17

Java identifiers must start with a(n) _________ and may contain any combination of letters and digits, but no spaces.

Question 18

______ is reserved as a special code for "not a character."

Question 19

The mod operator % returns the __________ of the division between two numbers.

Question 20

In addition to having the same name as the class name, each Java source code file must have a(n) _________extension.

Question 21

Which one of these is not a primitive data type?

A) int
B) double
C) bool
D) long
E) char

Question 22

The result of 3 / 2 is:

A) 1.
B) 1.5.
C) 3.
D) 2.
E) 0.

Question 23

The result of 9 % 2 is:

A) 1.
B) 4.5.
C) 4.
D) 2.
E) 0.

Question 24

The result of 3.0 / 2 is:

A) 1.
B) 1.5.
C) 3.
D) 2.
E) 0.

Question 25

The result of (double) ( 3 / 2 ) is:

A) 1.0.
B) 1.5.
C) 3.0.
D) 2.0.
E) 0.0.

Question 26

The result of (double) 3 / 2 is:

A) 1.0.
B) 1.5.
C) 3.0.
D) 2.0.
E) 0.0.

Question 27

helloWorld is a valid identifier.

Question 28

int9 is a valid identifier.

Question 29

char is a valid identifier.

Question 30

2008taxRate is a valid identifier.

Question 31

tax Rate is a valid identifier.

Question 32

A double is more precise than a float.

Question 33

* is a unary operator.

Question 34

The Java keyword for a constant is __________.

Question 35

The two floating point data types are __________ and float.

Question 36

char values are surrounded by __________ quotes.

Question 37

String literals are surrounded by __________ quotes.

Question 38

A Java escape sequence starts with a(n) __________.

Question 39

The division operator / returns the __________ of the division between two numbers.

Question 40

Describe two ways to introduce a comment.

Question 41

Compare and contrast single-precision and double-precision floating-point data types.

Question 42

When you declare a variable, with an assignment operator (=) with the following syntax:
dataType variableName = initialValue;
How would you read the sentence?

Question 43

Would it be better to use doubles or floats for calculations to scale up recipes to feed three times as many people as the recipes are written to serve?

Question 44

What are three ways to add 1 to an int variable named number?

Question 45

Assuming number is an int variable, write a statement using a shortcut operator equivalent to this one:
number = number * 5;

Question 46

Rewrite the following into one statement:
int age;
age = 32;

Question 47

You want to insert the comment "Java is better than ice cream." Identify two ways to include this comment in your code.

Question 48

What are some advantages of using variables?

Question 49

Compare the variable identifiers numberOfStudentsPassing and winners. Describe which would be preferable in a program that evaluates success of a teaching program.

Question 50

Sam wants to calculate whether his students simply passed or failed. He uses a char variable, because student grades are A through F. Is this the best data type to use? Why or why not?

Question 51

One way to specify an initial value for a variable (variable 1) is to assign the variable the value of another variable (variable 2). Explain why it is not valid to assign variable 1 as a double and variable 2 as a float.

Question 52

What will happen if your String literal is longer than one line?

Question 53

List two errors in the following statement:
System.out.println( "Remember the slogan "Click It or Ticket" and buckle
your seatbelt before driving your car." );

Question 54

How would you create an indented poem in a String literal statement?

Question 55

Would it be better to write PI or 3.14159 in an arithmetic expression?

Question 56

In which order should the computer do the following calculation? Solve the expression.
int dimes = 2 * 20 + 5 * 10 + 3 * 5;

Question 57

What does the shortcut ++ do?