Question 1

What is wrong with the following code snippet?
Int average;
Average = 78A;

Accepted Answer

A)  The average variable is never initialized. 
B)  The data type for the average variable is not specified. 
C)  The average variable is never assigned a value. 
D)  The average variable is assigned a non-numeric value. 
A)  The average variable is never initialized. 
B)  The data type for the average variable is not specified. 
C)  The average variable is never assigned a value. 
D)  The average variable is assigned a non-numeric value.

Question 2

Which one of the following statements defines a constant with the value 123?

Accepted Answer

A)  final int MY_CONST = 123; 
B)  const int MY_CONST = 123; 
C)  final int MY_CONST; MY_CONST = 123; 
D)  static int MY_CONST = 123; 
A)  final int MY_CONST = 123; 
B)  const int MY_CONST = 123; 
C)  final int MY_CONST; MY_CONST = 123; 
D)  static int MY_CONST = 123;

Question 3

What is the value of Math.abs(-2)?

Accepted Answer

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

Question 4

What is the output of the following code snippet?
System.out.printf("%5.3f", 20.0);

Accepted Answer

A)  20 
B)  20.0 
C)  20.00 
D)  20.000 
A)  20 
B)  20.0 
C)  20.00 
D)  20.000

Question 5

Which of the following statements displays
Price = 20.00

Accepted Answer

A)  System.out.print("price = ");
System.out.printf(price); 
B)  System.out.print("price = ");
System.out.printf("%f", price); 
C)  System.out.print("price = ");
System.out.printf("%10.2f", price); 
D)  System.out.print("price = ");
System.out.printf("%2.10f", price); 
A)  System.out.print("price = ");
System.out.printf(price); 
B)  System.out.print("price = ");
System.out.printf("%f", price); 
C)  System.out.print("price = ");
System.out.printf("%10.2f", price); 
D)  System.out.print("price = ");
System.out.printf("%2.10f", price);

Question 6

Which of the following statements about constants in Java are true?
I. Although not required, constants are commonly named using uppercase letters
II. Only integer values can appear as constants
III. A variable can be defined with an initial value, but the reserved word final prevents it from being changed
IV. A named constant makes computations that use it clearer

Accepted Answer

A)  I, II, III 
B)  II, III, IV 
C)  I, III, IV 
D)  I, II, IV 
A)  I, II, III 
B)  II, III, IV 
C)  I, III, IV 
D)  I, II, IV

Question 7

Which is the Java equivalent of the following mathematical expression?
C = (√a + √b)2

Accepted Answer

A)  c = Math.sqrt(a * 2 + b * 2); 
B)  c = Math.sqrt(a * 2) + Math.sqrt(b * 2); 
C)  c = Math.sqrt(pow(a, 2) + Math.pow(b, 2)); 
D)  c = Math.pow((Math.sqrt(a) + Math.sqrt(b)), 2); 
A)  c = Math.sqrt(a * 2 + b * 2); 
B)  c = Math.sqrt(a * 2) + Math.sqrt(b * 2); 
C)  c = Math.sqrt(pow(a, 2) + Math.pow(b, 2)); 
D)  c = Math.pow((Math.sqrt(a) + Math.sqrt(b)), 2);

Question 8

One way to avoid round-off errors is to use:

Accepted Answer

A)  Math.sqrt() 
B)  Math.pow() 
C)  Math.round() 
D)  Math.truncate() 
A)  Math.sqrt() 
B)  Math.pow() 
C)  Math.round() 
D)  Math.truncate()

Question 9

Which of the following is the Java equivalent of the following mathematical expression?
C = 2$\pi$ . radius

Accepted Answer

A)  c = 2 * Math.PI * radius * 2; 
B)  c = 2 * Math.PI * Math.pow(2, radius); 
C)  c = 2 * Math.PI * Math.pow(radius, 2); 
D)  c = 2 * Math.PI * radius; 
A)  c = 2 * Math.PI * radius * 2; 
B)  c = 2 * Math.PI * Math.pow(2, radius); 
C)  c = 2 * Math.PI * Math.pow(radius, 2); 
D)  c = 2 * Math.PI * radius;

Question 10

Which one of the following refers to a number constant that appears in code without explanation?

Accepted Answer

A)  Constant 
B)  Variable 
C)  Magic number 
D)  String literal 
A)  Constant 
B)  Variable 
C)  Magic number 
D)  String literal

Question 11

What is wrong with the following code snippet?
Int price;
Price = 9.42;

Accepted Answer

A)  The price variable is never initialized. 
B)  The data type for the price variable is not specified. 
C)  The price variable is never assigned a value. 
D)  The price variable is assigned a decimal value. 
A)  The price variable is never initialized. 
B)  The data type for the price variable is not specified. 
C)  The price variable is never assigned a value. 
D)  The price variable is assigned a decimal value.

Question 12

What is the output of the following code snippet?
Public static void main(String[] args)
{
Double x;
X = Math.pow(3.0, 2.0) + Math.pow(4.0, 2.0);
System.out.println(x);
}

Accepted Answer

A)  25.0 
B)  34 
C)  7.0 
D)  14 
A)  25.0 
B)  34 
C)  7.0 
D)  14

Question 13

Which of the following is the mathematical equivalent of the following Java expression?
H = (4.0 * a * b - Math.pow(b, 2)) / c;

Accepted Answer

A)  h = 4ab - 2b / c 
B)  h = (4ab - 2b) / c 
C)  h = 4ab - b2 / c 
D)  h = (4ab - b2) / c 
A)  h = 4ab - 2b / c 
B)  h = (4ab - 2b) / c 
C)  h = 4ab - b2 / c 
D)  h = (4ab - b2) / c

Question 14

Which is the appropriate time to initialize a variable?

Accepted Answer

A)  When you define it 
B)  When you use it 
C)  At the end of the program 
D)  Before the main function 
A)  When you define it 
B)  When you use it 
C)  At the end of the program 
D)  Before the main function

Question 15

Which statement about number literals in Java is false?

Accepted Answer

A)  Numbers in exponential notation always have type double 
B)  Zero is an integer 
C)  Integers must be positive 
D)  An integer with fractional part of .0 has type double. 
A)  Numbers in exponential notation always have type double 
B)  Zero is an integer 
C)  Integers must be positive 
D)  An integer with fractional part of .0 has type double.

Question 16

What is wrong with the following code?
Int count = 2000 * 3000 * 4000;

Accepted Answer

A)  Wrong data type 
B)  Variable is undefined 
C)  Integer overflow 
D)  Illegal expression 
A)  Wrong data type 
B)  Variable is undefined 
C)  Integer overflow 
D)  Illegal expression

Question 17

What is the value inside the var variable at the end of the given code snippet?
Public static void main(String[] args)
{
Int var = 30;
Var = var + 2 / var;
Var++;
}

Accepted Answer

A)  0 
B)  1 
C)  30 
D)  31 
A)  0 
B)  1 
C)  30 
D)  31

Question 18

What is the output of the following code snippet?
Public static void main(String[] args)
{
Int value = 25;
Value = value * 2;
Value--;
System.out.println(value);
}

Accepted Answer

A)  25 
B)  50 
C)  49 
D)  26 
A)  25 
B)  50 
C)  49 
D)  26

Question 19

What does the following statement sequence print?
String str = "Java";
Str += " is powerful";
System.out.println(str);

Accepted Answer

A)  Java is powerful 
B)  Java + is powerful 
C)  is powerful 
D)  Compile-time error 
A)  Java is powerful 
B)  Java + is powerful 
C)  is powerful 
D)  Compile-time error

Question 20

In an airline reservation system, the number of available seats in an airplane is required. Which data type should be used to store this value?

Accepted Answer

A)  double 
B)  float 
C)  int 
D)  long 
A)  double 
B)  float 
C)  int 
D)  long

Exam 2: Fundamental Data Types

What is wrong with the following code snippet? Int average; Average = 78A;

Which one of the following statements defines a constant with the value 123?

What is the value of Math.abs(-2)?

What is the output of the following code snippet? System.out.printf("%5.3f", 20.0);

Which of the following statements displays Price = 20.00

Which is the Java equivalent of the following mathematical expression? C = (√a + √b)2

One way to avoid round-off errors is to use:

Which of the following is the Java equivalent of the following mathematical expression? C = 2 π\piπ . radius

Which one of the following refers to a number constant that appears in code without explanation?

What is wrong with the following code snippet? Int price; Price = 9.42;

What is the output of the following code snippet? Public static void main(String[] args) { Double x; X = Math.pow(3.0, 2.0) + Math.pow(4.0, 2.0); System.out.println(x); }

Which of the following is the mathematical equivalent of the following Java expression? H = (4.0 * a * b - Math.pow(b, 2)) / c;

Which is the appropriate time to initialize a variable?

Which statement about number literals in Java is false?

What is wrong with the following code? Int count = 2000 * 3000 * 4000;

What is the value inside the var variable at the end of the given code snippet? Public static void main(String[] args) { Int var = 30; Var = var + 2 / var; Var++; }

What is the output of the following code snippet? Public static void main(String[] args) { Int value = 25; Value = value * 2; Value--; System.out.println(value); }

What does the following statement sequence print? String str = "Java"; Str += " is powerful"; System.out.println(str);

In an airline reservation system, the number of available seats in an airplane is required. Which data type should be used to store this value?

Introduction

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The Java Collections Framework

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Which is the Java equivalent of the following mathematical expression? C = (√a + √b)²

Which of the following is the Java equivalent of the following mathematical expression? C = 2 $\pi$ . radius