Deck 2: Basic Elements of Java

Question 1

When evaluating a mixed expression, all integer operands are converted to floating-point numbers with the decimal part of zero.

Answer 1

True

Question 2

Suppose console is a Scanner object initialized with the standard input device. The expression console.nextInt(); is used to read one int value and the expression console.nextDouble(); is used to read two int values.

Answer 2

False

Question 3

An identifier can be any sequence of characters and integers.

Answer 3

False

Question 4

Operators of the same precedence are evaluated from right to left.

Question 5

A value such as 'd' is called a character constant.

Question 6

The number of significant digits in a double variable is up to 15.

Question 7

Suppose that index is an int variable. The statement index = index + 1; is equivalent to index++;

Question 8

The value of a variable may change during program execution.

Question 9

When a value of one data type is automatically changed to another data type, an implicit type coercion has occurred.

Question 10

The pair of characters // is used for single line comments.

Question 11

An operator that has only one operand is called a unique operator.

Question 12

Java automatically initializes all variables.

Question 13

The null string contains only the blank character.

Question 14

If a = 4; and b = 3;, then after the statement a = b; executes, the value of b is 4 and the value of a is 3.

Question 15

Suppose x = 18.6. The output of the statement System.out.println((int)(x) / 3); is 6.

Question 16

The Java language is strongly typed.

Question 17

Suppose console is a Scanner object initialized with the standard input device and feet and inches are int variables. Consider the following statements: feet = console.nextInt();
inches = console.nextInt(); These statements require the value of feet and inches to be input on separate lines.

Question 18

The symbol '5' does not belong to the char data type because 5 is a digit.

Question 19

The data type float is a floating-point data type.

Question 20

The == characters are a special symbol in Java.

Question 21

The character sequence \n moves the insertion point at the end of the current line.

Question 22

The value of the expression 14 % 3 is ____.

A) 1
B) 2
C) 3
D) 4

Question 23

Operators that have two operands are called ____.

A) unary operators
B) binary operators
C) operators
D) expressions

Question 24

In Java, a period is used to terminate a statement.

Question 25

The expression (int)8.7 evaluates to ____.

A) 8
B) 8.0
C) 9.0
D) 9

Question 26

The ____ rules of a programming language tell you which statements are legal, or accepted by the programming language.

A) semantic
B) logical
C) syntax
D) grammatical

Question 27

Which of the following is a valid int value?

A) 3279
B) 3,279
C) 3270.00
D) -922337203684547758808

Question 28

Suppose that x and y are int variables and x = 7 and y = 8. After the statement: x = x * y - 2; executes, the value of x is ____.

A) 42
B) 54
C) 56
D) 58

Question 29

Suppose x = 8. After the execution of the statement y = x++; y is 8 and x is 10.

Question 30

The memory allocated for a double value is ____ bytes.

A) 2
B) 4
C) 8
D) 16

Question 31

Which of the following is a valid char value?

A) '$_'
B) '%'
C) 'n\'
D) "a"

Question 32

What type of Java statement(s) stores a value in a variable?

A) input
B) output
C) assignment
D) Both an input statement and an assignment statement

Question 33

The value of the expression 5 + 10 % 4 - 3 is ____.

A) 0
B) 2
C) 4
D) 5

Question 34

If ++x is used in an expression, first the expression is evaluated, and then the value of x is incremented by 1.

Question 35

Which of the following statements about a named constant is NOT true?

A) Its content cannot change during program execution.
B) Its value can be changed during program execution.
C) It is a memory location.
D) It is declared using the reserved word final.

Question 36

The length of the string "first java program" is:

A) 16
B) 18
C) 19
D) 20

Question 37

Which of the following is NOT a reserved word in Java?

A) double
B) throws
C) static
D) num

Question 38

Both System.out.println and System.out.print can be used to output a string on the standard output device.

Question 39

The expression (double)(5 + 4) evaluates to ____.

A) 8
B) 9
C) 9.0
D) 10.0

Question 40

Which of the following is a valid Java identifier?

A) $pay
B) 4myGrade!
C) newGrade!
D) 1dollar

Question 41

Given
Char ch;
Int num;
Double pay; Which of the following assignment statements are valid?
(i) ch = ' * ' ;
(ii) pay = num * pay;
(iii) rate * 40 = pay;

A) Only (i) is valid
B) (i) and (ii) are valid
C) (ii) and (iii) are valid
D) (i) and (iii) are valid

Question 42

The declaration int a, b, c; is equivalent to which of the following?

A) int a , b c;
B) int a;
Int b;
Int c;
C) int abc;
D) int a b c;

Question 43

Consider the following program. // Insertion Point 1
Public class CircleArea
{
// Insertion Point 2
Static final float PI = 3.14 public static void main(String[]args)
{
//Insertion Point 3 float r = 2.0;
Float area;
Area = PI * r * r;
System.out.println( " Area = " + area);
}
// Insertion Point 4
} In the above code, where do the import statements belong?

A) Insertion Point 1
B) Insertion Point 2
C) Insertion Point 3
D) Insertion Point 4

Question 44

Which of the following is the newline character?

A) \r
B) \n
C) \l
D) \b

Question 45

____ are executable statements that inform the user what to do.

A) Variables
B) Prompt lines
C) Named constants
D) Expressions

Question 46

Suppose x = 4 and y = 2. If the statement x *= y; is executed once, what is the value of x?

A) 2
B) 4
C) 8
D) This is an illegal statement in Java.

Question 47

What is the output of the following statement? System.out.println("Welcome \n Home");

A) WelcomeHome
B) Welcome Home
C) Welcome Home
D) Welcome \n Home

Question 48

Consider the following program. public class CircleArea
{
Static Scanner console = new Scanner(System.in); static final float PI = 3.14; public static void main(String[]args)
{
Float r;
Float area;
R = console.nextDouble();
Area = PI * r * r;
System.out.println( " Area = " + area);
}
} To successfully compile this program, which of the following import statement is required?

A) import java.io;
B) import java.util;
C) import java.lang;
D) No import statement is required

Question 49

The standard output object in Java is ____.

A) output
B) System.out
C) Sys.out
D) System.in

Question 50

Suppose that alpha and beta are int variables. The statement alpha = --beta; is equivalent to the statement(s) ____.

A) beta = beta - 1; alpha = 1 - beta;
B) beta = beta - 1; alpha = beta - 1;
C) beta = beta - 1; alpha = beta;
D) alpha = beta; beta = beta - 1;