Question 1

Which of the given statements generates the following output?
\"///

Accepted Answer

A)  System.out.println("\"///"); 
B)  System.out.println("\\\"///"); 
C)  System.out.println("\\\""//////"); 
D)  system.out.println("\"///"); 
A)  System.out.println("\"///"); 
B)  System.out.println("\\\"///"); 
C)  System.out.println("\\\""//////"); 
D)  system.out.println("\"///");

Question 2

What is the meaning of x = 0; in Java?

Accepted Answer

A)  It checks whether x equals 0. 
B)  It sets the variable x to zero. 
C)  It defines a variable named x and initializes it with 0. 
D)  It is a syntax error because x is not always 0. 
A)  It checks whether x equals 0. 
B)  It sets the variable x to zero. 
C)  It defines a variable named x and initializes it with 0. 
D)  It is a syntax error because x is not always 0.

Question 3

Assuming that the user inputs a value of 25 for the price and 10 for the discount rate in the following code snippet, what is the output?
Public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.print("Enter the price: ");
Double price = in.nextDouble();
System.out.print("Enter the discount rate: ");
Double discount = in.nextDouble();
System.out.println("The new price is " +
Price - price * (discount / 100.0));
}

Accepted Answer

A)  The new price is 25 
B)  The new price is 15 
C)  The new price is 22.5 
D)  The new price is 20.0 
A)  The new price is 25 
B)  The new price is 15 
C)  The new price is 22.5 
D)  The new price is 20.0

Question 4

Consider the following division statements:
I. 22 / 7
II. 22.0 / 7
III. 22 / 7.0
Which of the following is correct?

Accepted Answer

A)  All three statements will return an integer value. 
B)  Only I will return an integer value. 
C)  Only I, II will return an integer value. 
D)  Only I and III will return an integer value. 
A)  All three statements will return an integer value. 
B)  Only I will return an integer value. 
C)  Only I, II will return an integer value. 
D)  Only I and III will return an integer value.

Question 5

Given the definition final double PI = 3.14159; which of the following is the Java equivalent of the mathematical expression c = $\pi$ . radius2

Accepted Answer

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

Question 6

Consider the following Java variable names:
I. 1stInstance
II. basicInt%
III. empName_
IV. addressLine1
V. DISCOUNT
Which of the following options is correct?

Accepted Answer

A)  Only IV is a valid Java variable name. 
B)  Only I and IV are valid Java variable names. 
C)  Only I, IV, and V are valid Java variable names. 
D)  Only III, IV, and V are valid Java variable names. 
A)  Only IV is a valid Java variable name. 
B)  Only I and IV are valid Java variable names. 
C)  Only I, IV, and V are valid Java variable names. 
D)  Only III, IV, and V are valid Java variable names.

Question 7

At what point in the problem-solving process should one write pseudocode?

Accepted Answer

A)  After writing Java code, as a way to summarize the code's algorithm 
B)  Before writing Java code, as a guide for a general solution 
C)  After defining Java variables so that the pseudocode and data types make sense 
D)  Before working out examples by hand in order to guide those examples 
A)  After writing Java code, as a way to summarize the code's algorithm 
B)  Before writing Java code, as a guide for a general solution 
C)  After defining Java variables so that the pseudocode and data types make sense 
D)  Before working out examples by hand in order to guide those examples

Question 8

Which one of the following statements gives the absolute value of the floating-point number x = -25.50?

Accepted Answer

A)  abs(x); 
B)  Math.abs(x); 
C)  x.abs(); 
D)  x.absolute(); 
A)  abs(x); 
B)  Math.abs(x); 
C)  x.abs(); 
D)  x.absolute();

Question 9

What are the values of num1 and num2 after this snippet executes?
Double num1 = 4.20;
Double num2 = num1 * 10 + 5.0;

Accepted Answer

A)  num1 = 4.20 and num2 = 63.0 
B)  num1 = 4.20 and num2 = 47.0 
C)  num1 = 42.0 and num2 = 42.0 
D)  num1 = 42.0 and num2 = 47.0 
A)  num1 = 4.20 and num2 = 63.0 
B)  num1 = 4.20 and num2 = 47.0 
C)  num1 = 42.0 and num2 = 42.0 
D)  num1 = 42.0 and num2 = 47.0

Question 10

How do you compute the length of the string str?

Accepted Answer

A)  length(str) 
B)  length.str 
C)  str.length 
D)  str.length() 
A)  length(str) 
B)  length.str 
C)  str.length 
D)  str.length()

Question 11

What (if any) type of error occurs with the following code if the user input is ABC?
Public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.print("Enter a number: ");
String str = in.next();
Int count = Integer.parseInt(str);
System.out.println("Input is " + count);
}

Accepted Answer

A)  Compile-time error 
B)  Run-time error 
C)  Overflow error 
D)  Illegal expression 
A)  Compile-time error 
B)  Run-time error 
C)  Overflow error 
D)  Illegal expression

Question 12

The first step in problem solving is

Accepted Answer

A)  To write the expression that calculates the answer 
B)  To understand the problem and its inputs and outputs 
C)  To do examples by hand that confirm the solution will work 
D)  To write Java code that can be executed and tested 
A)  To write the expression that calculates the answer 
B)  To understand the problem and its inputs and outputs 
C)  To do examples by hand that confirm the solution will work 
D)  To write Java code that can be executed and tested

Question 13

What is wrong with the following code snippet?
Int size = 42;
Cost = 9.99;
System.out.println("size = " + size);
System.out.println(" cost = " + cost);

Accepted Answer

A)  The code snippet uses a variable that has not yet been initialized. 
B)  The code snippet uses a variable that has not been declared. 
C)  The code snippet attempts to assign a decimal value to an integer variable. 
D)  The code snippet attempts to assign an integer value to a decimal variable. 
A)  The code snippet uses a variable that has not yet been initialized. 
B)  The code snippet uses a variable that has not been declared. 
C)  The code snippet attempts to assign a decimal value to an integer variable. 
D)  The code snippet attempts to assign an integer value to a decimal variable.

Question 14

Which of the following options is valid with reference to the code snippet?
Public static void main(String[] args)
{
Double d = 45.326;
Double r = d % 9.0;
System.out.println(r);
}

Accepted Answer

A)  The value inside the variable r will be 0.326 
B)  The value inside the variable r will be 5.036 
C)  Variable r has to be defined as an integer because the % operator always returns an integer 
D)  The initialization of variable r is wrong, because the % operator expects integer values as operands 
A)  The value inside the variable r will be 0.326 
B)  The value inside the variable r will be 5.036 
C)  Variable r has to be defined as an integer because the % operator always returns an integer 
D)  The initialization of variable r is wrong, because the % operator expects integer values as operands

Question 15

Which one of the following statements displays the output as (1.23e+02)?

Accepted Answer

A)  System.out.printf("%(5.2e", -123.0); 
B)  System.out.printf("%5.2e", -123.0); 
C)  System.out.printf("^5.2e", -123.0); 
D)  System.out.printf("%5.2E", -123.0); 
A)  System.out.printf("%(5.2e", -123.0); 
B)  System.out.printf("%5.2e", -123.0); 
C)  System.out.printf("^5.2e", -123.0); 
D)  System.out.printf("%5.2E", -123.0);

Question 16

Which of the given System.out.print statements generates the following output?
ABCDE"\

Accepted Answer

A)  System.out.println("ABCDE"\"); 
B)  System.out.println("ABCDE""); 
C)  System.out.println("ABCDE"\); 
D)  System.out.println("ABCDE""); 
A)  System.out.println("ABCDE"\"); 
B)  System.out.println("ABCDE""); 
C)  System.out.println("ABCDE"\); 
D)  System.out.println("ABCDE"");

Question 17

Which operator is used to concatenate two or more strings?

Accepted Answer

A)  + 
B)  % 
C)  & 
D)  ^ 
A)  + 
B)  % 
C)  & 
D)  ^

Question 18

What is the output of the following code snippet?
Int counter = 0;
Counter++;
System.out.print("The initial value of the counter is ");
System.out.println(count);

Accepted Answer

A)  The initial value of the counter is 0 
B)  The initial value of the counter is 1 
C)  The code will not compile 
D)  The initial value of the counter is 
A)  The initial value of the counter is 0 
B)  The initial value of the counter is 1 
C)  The code will not compile 
D)  The initial value of the counter is

Question 19

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

Accepted Answer

A)  Java is powerful 
B)  Java + is powerful 
C)  is powerful 
D)  Nothing; compile-time error 
A)  Java is powerful 
B)  Java + is powerful 
C)  is powerful 
D)  Nothing; compile-time error

Question 20

Which one of the following reserved words is used in Java to represent a value without a fractional part?

Accepted Answer

A)  integer 
B)  int 
C)  Int 
D)  Float 
A)  integer 
B)  int 
C)  Int 
D)  Float

Exam 2: Fundamental Data Types

Which of the given statements generates the following output? \\\"///

What is the meaning of x = 0; in Java?

Consider the following division statements: I. 22 / 7 II. 22.0 / 7 III. 22 / 7.0 Which of the following is correct?

Given the definition final double PI = 3.14159; which of the following is the Java equivalent of the mathematical expression c = π\piπ . radius2

Consider the following Java variable names: I. 1stInstance II. basicInt% III. empName_ IV. addressLine1 V. DISCOUNT Which of the following options is correct?

At what point in the problem-solving process should one write pseudocode?

Which one of the following statements gives the absolute value of the floating-point number x = -25.50?

What are the values of num1 and num2 after this snippet executes? Double num1 = 4.20; Double num2 = num1 * 10 + 5.0;

How do you compute the length of the string str?

The first step in problem solving is

What is wrong with the following code snippet? Int size = 42; Cost = 9.99; System.out.println("size = " + size); System.out.println(" cost = " + cost);

Which of the following options is valid with reference to the code snippet? Public static void main(String[] args) { Double d = 45.326; Double r = d % 9.0; System.out.println(r); }

Which one of the following statements displays the output as (1.23e+02)?

Which of the given System.out.print statements generates the following output? ABCDE"\

Which operator is used to concatenate two or more strings?

What is the output of the following code snippet? Int counter = 0; Counter++; System.out.print("The initial value of the counter is "); System.out.println(count);

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

Which one of the following reserved words is used in Java to represent a value without a fractional part?

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Given the definition final double PI = 3.14159; which of the following is the Java equivalent of the mathematical expression c = $\pi$ . radius²