Deck 2: Fundamental Data Types

Question 1

What will be the value stored in the variable x after the execution of the following code snippet?
Int a = 10;
Int b = 20;
Int c = 2;
Int x = b / a /*c*/;

A) 1
B) 2
C) 4
D) The code has a syntax error

Answer 1

B

Question 2

What will be the value inside the variables a and b after the given set of assignments?
Int a = 20;
Int b = 10;
A = (a +

A) a = 15, b = 16
B) / 2; b = a;
A++;
B) a = 16, b = 16
C) a = 16, b = 15
D) a = 15, b = 15

Answer 2

C

Question 3

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

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.

Answer 3

D

Question 4

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));
}

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 5

What is wrong with the following code snippet?

A) The code snippet uses an uninitialized variable.
B) The code snippet uses an undeclared variable.
C) The code snippet attempts to assign a decimal value to an integer variable.
D) The code snippet attempts to add a number to a string variable.

Question 6

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

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

Question 7

Which one of the following variables is assigned with valid literals?

A) int salary = 0;
Salary = 5000.50;
B) int salary1 = 0;
Salary1 = 1.2E6;
C) double salary2 = 0;
Salary2 = 2.96E-2;
D) long salary3 = 0;
Salary3 = 1E-6;

Question 8

What is the result of the following code snippet?
Public static void main(String[] args)
{
Double circleRadius;
Double circleVolume = 22 / 7 * circleRadius * circleRadius;
System.out.println(circleVolume);
}

A) 0
B) 3.14
C) 6.28
D) compile-time error

Question 9

Which of the following options declares a float variable?

A) Float age;
B) flt age;
C) float age;
D) age: float;

Question 10

Which of the following guidelines will make code more explanatory for others?

A) Use more statements in source code.
B) Add comments to source code.
C) Avoid usage of complex calculations in source code.
D) Always enclose the statements in curly braces in source code.

Question 11

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);
}

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

Question 12

Which is the Java equivalent of the following mathematical expression?
C = √(a² + b²)

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

Question 13

What is the value inside the value variable at the end of the given code snippet?
Public static void main(String[] args)
{
Int value = 3;
Value = value - 2 * value;
Value++;
}

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

Question 14

What is the result of the following expression?
Double d = 2.5 + 4 * -1.5 - (2.5 + 4) * -1.5;

A) 24.375
B) 6.25
C) 12.375
D) 6

Question 15

Which of the following statements is correct about constants?

A) Constants are written using capital letters because the compiler ignores constants declared in small letters.
B) The data stored inside a constant can be changed using an assignment statement.
C) You can make a variable constant by using the final reserved word when declaring it.
D) Constant variables can only be changed through the Math library.

Question 16

Which one of the following operators computes the remainder of an integer division?

A) /
B) %
C) \
D) !

Question 17

What is the output of the following code snippet?
Public static void main(String[] args)
{
Double a;
A = Math.sqrt(9.0) + Math.sqrt(16.0);
System.out.println(a);
}

A) 25.0
B) 337.0
C) 7.0
D) 19.0

Question 18

What is the output of the following code snippet?
Public static void main(String[] args)
{
Int value = 3;
Value++;
System.out.println(value);
}

A) 2
B) 3
C) 4
D) No output due to syntax error

Question 19

What is the value of Math.pow(3, 2)?

A) 6
B) 9
C) 8
D) 5

Question 20

Which of the following statements with comments is(are) valid?
I) int cnt = 0; /* Set count to 0
II) int cnt = 0; /* Set count to 0 */
III) int cnt = 0; // Set count to 0

A) Only I is valid
B) I and II are valid
C) II and III are valid
D) Only III is valid

Question 21

Which one of the following statements can be used to extract the last five characters from any string variable str?

A) str.substring(str.length() - 5, str.length())
B) str.substring(5, 5)
C) str.substring(str.length() - 4, 5)
D) str.substring(str.length() - 5, 5)

Question 22

What is the output of the following code snippet?
Public static void main(String[] args)
{
Int var1 = 10;
Int var2 = 2;
Int var3 = 20;
Var3 = var3 / (var1 % var2);
System.out.println(var3);
}

A) 0
B) 4
C) 20
D) There will be no output due to a run-time error.

Question 23

What happens to the fractional part when a division is performed on two integer variables?

A) The fractional part is rounded off to the nearest integer value.
B) The fractional part is discarded.
C) Two integers cannot be used in division; at least one of the operands should be a floating-point number.
D) Instead of using an integer division, you should use the modulus operator to perform floating-point division.

Question 24

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

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

Question 25

What is the output of the following code snippet?
Public static void main(String[] args){
{
String str1;
Str1 = "I LOVE MY COUNTRY";
String str2 = str1.substring(4, 9);
System.out.println(str2);
}

A) I LOV
B) OVE M
C) V
D) VE MY

Question 26

Which operator is used to concatenate two or more strings?

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

Question 27

Which of the methods below are static methods?
I) length
II) substring
III) pow
IV) sqrt

A) All the methods are static
B) Only I, II and III
C) Only II and IV
D) Only III and IV

Question 28

Which one of the following is a correct representation of the given mathematical expression in Java?
A + b
2

A) a + b % 2
B) / 2
B) a + b / 2
C) a + (b / 2)
D) (a +

Question 29

Which of the following is the Java equivalent of the following mathematical expression?
C = 2 $\pi$ . 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 30

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);
}

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 31

What is the output of the following code snippet?
Public static void main(String[] args)
{
Int s;
Double f = 365.25;
S = f / 10;
System.out.println(s);
}

A) 36
B) 36.525
C) 37
D) No output because the code snippet generates compilation errors

Question 32

Assuming that the user inputs a value of 25000 for the pay and 10 for the bonus 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 pay: ");
Double pay = in.nextDouble();
System.out.print("Enter the bonus rate: ");
Double bonus = in.nextDouble();
System.out.println("The new pay is " +
(pay + pay * (bonus / 100.0)));
}

A) The new pay is 25000
B) The new pay is 25100
C) The new pay is 27500
D) The new pay is 30000

Question 33

Assuming that the user enters 45 and 62 as inputs for n1 and n2, respectively, what is the output of the following code snippet?
Public static void main(String[] args)
{
System.out.print("Enter a number: ");
Scanner in = new Scanner(System.in);
String n1 = in.next();
System.out.print("Enter another number: ");
String n2 = in.next();
String result = n1 + n2;
System.out.print(result);
}

A) 46
B) 4662
C) 107
D) 4562

Question 34

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

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

Question 35

How do you compute the length of the string str?

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

Question 36

Assuming that the user inputs "Joe" at the prompt, what is the output of the following code snippet?
Public static void main(String[] args)
{
System.out.print("Enter your name ");
String name;
Scanner in = new Scanner(System.in);
Name = in.next();
Name += ", Good morning";
System.out.print(name);
}

A) The code snippet does not compile because the += operator cannot be used in this context.
B) Joe, Good morning
C) , Good morning
D) Joe

Question 37

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

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

Question 38

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

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 39

What is the result of the following statement?
String s = "You" + "had" + "me" + "at" + "hello";

A) The string s has the following value: "You had me at "hello"
B) The statement results in an error because the + operator can be used only with numbers
C) The statement results in an error because the + operation cannot be performed on string literals
D) The string s has the following value: "Youhadmeathello"

Question 40

What output is produced by these statements?
String name = "Joanne Hunt";
System.out.println(name.length());

A) 8
B) 10
C) 9
D) 11

Question 41

Which one of the following statements can be used to convert a string str to a double?

A) double n = str.parseDouble();
B) double n = Integer.parseDouble(str);
C) double n = Double.parseDouble(str);
D) double n = double.parseDouble(str);

Question 42

What does the following statement sequence print?
String str = "Harry";
Int n = str.length();
String mystery = str.substring(0, 1) + str.substring(n - 2, n);
System.out.println(mystery);

A) Ha
B) Har
C) Hy
D) Hry

Question 43

Which is the Java equivalent of the following mathematical expression?
C = (√a + √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 44

Which of the following is the Java equivalent of the following mathematical expression?
P = 2 . $\pi$ .(radius)³

A) p = 2 * Math.PI * (radius * 3);
B) p = Math.PI * Math.pow(3, radius);
C) p = 2 * Math.PI * Math.pow(radius, 3);
D) p = 2 * Math.pow(Math.PI * radius, 3);

Question 45

What will be the value inside the variables x and y after the given set of assignments?
Int x = 20;
Int y = 10;
X = (x - y) * 2;
Y = x / 2;

A) x = 40, y = 20
B) x = 20, y = 10
C) x = 10, y = 20
D) x = 20, y = 20

Question 46

How do you extract the first 5 characters from the string str?

A) substring(str, 5)
B) substring.str(0, 5)
C) str.substring(5)
D) str.substring(0, 5)

Question 47

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++;
}

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

Question 48

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

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

Question 49

Which one of the following statements can be used to extract the last 10 characters from the string variable str?

A) str.substring(str.length() - 10, str.length())
B) str.substring(10, str.length())
C) str.substring(str.length() - 9, 10)
D) str.substring(0, 10)

Question 50

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

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 51

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);
}

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

Question 52

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

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

Question 53

Which one of the following statements can be used to get the fifth character from a string str?

A) char c = str.charAt(5);
B) char c = str.charAt(4);
C) char c = str[5];
D) char c = str[4];

Question 54

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

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

Question 55

Assuming that the user enters 23 and 45 as inputs for num1 and num2, respectively, what is the output of the following code snippet?
Public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.print("Enter a number: ");
String num1 = in.next();
System.out.print("Enter another number: ");
String num2 = in.next();
System.out.println(num1 + num2);
}

A) 23
B) 4523
C) 68
D) 2345

Question 56

Which one of the following statements displays the output as +00321.00?

A) System.out.printf("+%09.2f", 321.0);
B) System.out.printf("%009,2f", 321.0);
C) System.out.printf("+9.2f", 321.0);
D) System.out.printf("%09.00f", 321.0);

Question 57

Which one of the following statements defines a constant with the value 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 58

Which one of the following statements displays the output as 54321.00?

A) System.out.printf("%8.2f", 54321.0);
B) System.out.printf("%8,2f", 54321.0);
C) System.out.printf(",8.2f", 54321.0);
D) System.out.printf("%8.00f", 54321.0);

Question 59

What is the output of the following code snippet?
Public static void main(String[] args)
{
Int num1 = 10;
Int num2 = 5;
Int num3 = 200;
Num3 = num3 % (num1 * num2);
System.out.println(num3);
}

A) 0
B) 4
C) 10
D) 250

Question 60

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);
}

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

Question 61

What is the output of the following statement sequence?
Public static void main(String[] args)
{
Int x = 100.0 % 6.0;
System.out.println(x);
}

A) 4
B) Compile-time error
C) Run-time error
D) 16

Question 62

What is the output of the following code snippet?
String firstname = "William";
String lastname;
System.out.println("First: " + first);
System.out.println("Last: " + lastname);

A) First: William
Last:
B) First: William
Last: lastname
C) Code will not compile
D) Unpredictable output

Question 63

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

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

Question 64

What is the output of this code snippet?
Double average;
Int grade1 = 87;
Int grade2 = 94;
// System.out.print("The average is " + (grade1 + grade2) / 2.0);
System.out.print("The average is " + average);

A) Unpredictable result
B) The average is 91.5
C) The average is 91.5 The average is 91.5
D) The average is 91.5 The average is 0.0

Question 65

The problem solving process emphasizes a "first, do-it-by-hand" approach because

A) Pseudocode is not able to capture the subtleties of complex problems.
B) it is faster to do computations by hand than to do them by computer.
C) this guarantees that programs will be correct.
D) if programmers cannot compute a solution by hand, it is unlikely they will be able to write a program that can do it.

Question 66

What does the following statement sequence print if the user input is 123?
Public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.print("Enter a number: ");
String str = in.next();
Str += 456;
System.out.println(str);
}

A) 579
B) Compile-time error
C) Run-time error
D) 123456

Question 67

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

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 68

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);

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 69

Which statement is true?

A) Variables cannot be assigned and declared in the same statement
B) Variable names must contain at least one dollar sign
C) Variable names can be no more than 8 characters long
D) It is incorrect to initialize a string variable with a number

Question 70

What does the following statement sequence print?
String str = "Hello";
Int n = str.length();
String mystery = str.substring(0, 1)
+ str.substring(n - 2, n + 1);
System.out.println(mystery);

A) Run-time error
B) He
C) Ho
D) Hry

Question 71

What does the following statement sequence print?
String str = "Java Is Good";
Int n = str.length();
String mystery = str.substring(n - 4, n) +
Str)charAt(4) + str.substring(0, 4);
System.out.println(mystery);

A) Java
B) Good Java
C) Good
D) Is Good

Question 72

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

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

Question 73

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

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

Question 74

What is the correct way to invoke methods on variables in Java that are strings?

A) Methods can only be invoked on string constants, not on variables.
B) For each method there is a special operator that must be used.
C) There are no methods available in Java for string variables.
D) Invoke them using the variable name and the dot (.) notation.

Question 75

The first step in problem solving is

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 76

What does the following statement sequence print if the user input is 123?
Public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.print("Enter a number ");
Int myInt = in.nextInt();
MyInt += 456;
System.out.println(myInt);
}

A) 579
B) Compile-time error
C) Run-time error
D) 123456

Question 77

Suppose a phone number, stored as a ten-character string (of digits only) called phoneNumber, must be converted into a string that has parentheses around the area code. Which statement below will do that?

A) String newNumber = "(" + phoneNumber.substring(3, 0) + ")";
B) String newNumber = "(" + ")" + phoneNumber;
C) String newNumber = "(" + phoneNumber.substring(1, 3) + ")" + phoneNumber.substring(3, 7);
D) String newNumber = "(" + phoneNumber.substring(0, 3) + ")" + phoneNumber.substring(3, 10);

Question 78

What is the output of this code snippet?
Int sum = 22;
Sum = sum + 2;
System.out.print(sum); // sum = sum + 4;
System.out.print(sum);

A) 2424
B) 2425
C) 2428
D) 2528

Question 79

The assignment operator

A) denotes mathematical equality
B) places a new value into a variable
C) means the same as the equals sign used in algebra
D) makes it illegal to write a statement like sum = sum + 4;

Question 80

Which statement about number literals in Java is false?

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.