Deck 4: Fundamental Data Types

Question 1

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

Answer 1

C

Question 2

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 2

B

Question 3

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.

Answer 3

C

Question 4

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 5

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 6

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.

Question 7

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

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

Question 8

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

A) num1 = 4.20 and num2 = 42.0
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 9

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 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

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 12

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 13

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 14

What is wrong with the following code snippet? public class Area
{
Public static void main(String[] args)
{
Int width = 10;
Height = 20.00;
System.out.println("area = " + (width * height));
}
}

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 15

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

A) 6.0
B) 9.0
C) 8.0
D) 5.0

Question 16

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 17

Which of the following options declares a float variable?

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

Question 18

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 19

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 20

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

Question 21

How do you compute the length of the string str?

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

Question 22

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 23

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 24

Which operator is used to concatenate two or more strings?

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

Question 25

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 26

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 27

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 28

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 29

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 30

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 31

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 32

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 33

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 34

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 35

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, 11);
System.out.println(str2);
}

A) OVE MY
B) OVE MY C
C) VE MY CO
D) VE MY C

Question 36

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 37

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 38

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 39

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 40

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 41

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 42

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

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

Question 43

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 44

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 45

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 46

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 47

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

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

Question 48

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 49

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 50

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 51

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 52

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 53

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 54

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 55

Which one of the following statements displays the output as +000321.00?

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 56

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 57

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 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

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 61

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 62

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 63

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 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) Compile-time error
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

What is the difference between the result of the following two Java statements?
I) int cents = (int)(100 * price + 0.5);
II) int cents = (100 * price + 0.5);

A) Statement I causes truncation, but II does not
B) Statement II causes truncation, but I does not
C) Statement I compiles, but II does not
D) Statement II compiles, but I does not

Question 66

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 67

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 68

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 69

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.

Question 70

Which option represents the best choice for a variable name to represent the average grade of students on an exam?

A) averageGrade
B) $averageGrade
C) avg
D) AveGd

Question 71

The typical ranges for integers may seem strange but are derived from

A) Base 10 floating-point precision
B) Field requirements for typical usage and limits
C) Overflows
D) Powers of two because of base 2 representation within the computer

Question 72

What is result of evaluating the following expression? (45 / 6) % 5

A) 2
B) 7
C) 2.5
D) 3

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 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 75

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 76

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 77

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 78

Which statements about numeric types in Java are true?
I) There is more than one integer type
II) The data type float uses twice the storage of double
III) The numeric range of the Java integer type is related to powers of two

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

Question 79

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 80

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