Deck 4: Fundamental Data Types

Question 1

Which of the following statements with comments is(are) valid?

A)Only I
B)I and II
C)II and III
D)Only III

Answer 1

II and III

Question 2

What is wrong with the following code snippet?

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 2

The average variable is assigned a non-numeric value.

Question 3

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

A)Use shorter statements and shorter variable names 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.

Answer 3

Add comments to source code.

Question 4

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 5

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 6

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

A) int salary =0;
salary = 5000.50;
B) int salary 1=0;
salary 1=1.2E6;
C) double salary 2=0;
salary 2=2.96E-2;
D) long salary 3=0;
salary 3=1E-6;

Question 7

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

A) final int MY_CONST = 1 2 3 ;
B) const int MY_CONST =123;
C) final int
MY_CONST =0 ;
MY CONST =123 ;
D) static int MY_CONST =123;

Question 8

What is the output of this code snippet?

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

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

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 11

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 12

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 13

What is the result of the following code snippet?

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

Question 14

What will be the value stored in the variable x after the execution of the following code snippet?

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

Question 15

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 16

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 17

What is the output of the following code snippet?

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 18

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 19

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 20

Which of the following statements about constants is correct?

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 21

What is wrong with the following code snippet?

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 22

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?

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

Question 23

What is the value of the following expression?
-18 % 5

A)-2
B)-3
C)2
D)3

Question 24

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

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 25

Which of the following options defines an integer variable?

A)char age;
B)integer age;
C)int age;
D)age: int;

Question 26

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

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 27

What is the value of the following expression?
2 + 3 + 5 / 2

A)5
B)6
C)7
D)7.5

Question 28

What is the result of the following code snippet?

A)0
B)1
C)2
D)Does not compile

Question 29

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 30

Which statement is true about variable names in Java?

A)They can contain the percent sign (%)
B)They can contain an underscore symbol ("_")
C)They can contain spaces
D)They must make sense as a word

Question 31

Which one of the following types of statements is an instruction to set the value of a variable?

A)Update
B)Declaration
C)Assignment
D)Initialization

Question 32

Which of the following statements is correct about constants?

A)Constants are written using uppercase letters because the compiler ignores constants declared in lowercase letters.
B)The data stored inside a final variable can be changed using an assignment statement.
C)You can make a variable constant by using the constant reserved word while declaring the variable.
D)Variables defined using final make a code snippet more readable and easier to maintain.

Question 33

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 34

Why is the double type not appropriate for financial calculations?

A)Roundoff errors occur when an exact representation of a floating point number is not possible.
B)The range is too small.
C)The calculations are too slow.
D)There are too few significant digits.

Question 35

What is wrong with the following code snippet?

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 36

What is the upper limit on the size of an integer represented by the BigInteger object in Java?

A)32,767
B)2,147,483,647
C)9,223,372,036,854,775,807
D)Essentially no limit

Question 37

Which one of the following is a correct method for defining and initializing an integer variable with name value?

A)int value = 30;
B)Int value = 30;
C)int value = .30;
D)Int value = .30;

Question 38

Which one of the following is an assignment statement?

A)int a = 20;
B)a = 20;
C)assign a = 20;
D)assign 20 to a;

Question 39

Which is a legal number literal of type int in Java?

A)100,000
B)100.000
C)100_000
D)100000L

Question 40

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

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

Question 41

What is the output of the following code snippet?

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

Question 42

Which is a correct representation of the given mathematical expression in Java?

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

Question 43

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

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

Question 44

What is the output of the following code snippet?

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

Question 45

What is the value of the value variable at the end of the given code snippet?

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

Question 46

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 47

What is the output of the following code snippet?

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

Question 48

Which is the Java equivalent of the following mathematical expression?

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 49

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

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

Question 50

What is the value of the following expression?
1 % 12

A)1
B)0
C)-11
D)This is an error because 12 is greater than 1

Question 51

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 52

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 53

What is the output of the following code snippet?

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

Question 54

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

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

Question 55

What is the output of the following code snippet?

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

Question 56

Which is the Java equivalent of the following mathematical expression?

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 57

What is the output of the following code snippet?

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

Question 58

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 59

What will be the value of the variables a and b after the given set of assignments?

A)a = 15, b = 16
B)a = 16, b = 16
C)a = 16, b = 15
D)a = 15, b = 15

Question 60

What are the values of num1 and num2 after this snippet executes?

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 61

Given the definition final double PI = 3.14159; which of the following is the Java equivalent of the mathematical expression

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 62

When you purchase donuts, they come in boxes of 12, so 24 donuts take 2 boxes.All donuts need to be in a box, so if you buy 13 donuts, you'll get 2 boxes with 12 in the first box and 1 in the second.If the integer variable numberOfDonuts contains the positive number of donuts purchased, which of the following will correctly give the number of boxes needed?

A)int numberOfBoxes = (numberOfDonuts + 11) / 12;
B)int numberOfBoxes = numberOfDonuts / 12;
C)int numberOfBoxes = 1 + numberOfDonuts / 12;
D)int numberOfBoxes = numberOfDonuts / 12 + numberOfDonuts % 12;

Question 63

Which is the Java equivalent of the following mathematical expression?

A)c = (Math.sqrt(a) + Math.sqrt(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.pow((Math.sqrt(a) + Math.sqrt(b)), 2);

Question 64

What is the output of the following code snippet?

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

Question 65

Assume the following variables have been declared as shown and given values elsewhere:
double a, b, c;
The discriminant of a quadratic equation is defined to be: Which of the following statements will assign the correct value to discriminant?

A)double discriminant = Math.sqrt(b * b - 4 * a * c);
B)double discriminant = Math.sqrt(b * b) - 4 * a * c;
C)double discriminant = Math.sqrt(b * b) - Math.sqrt(4 * a * c);
D)double discriminant = Math.sqrt(b2 - 4ac)

Question 66

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?

A)The new pay is 25000.0
B)The new pay is 25100.0
C)The new pay is 27500.0
D)The new pay is 30000.0

Question 67

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?

A)The new price is 25.0
B)The new price is 15.0
C)The new price is 22.5
D)The new price is 20.0

Question 68

What is the value of the var variable at the end of the given code snippet?

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

Question 69

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 70

Which of the following statements will assign the largest value of three integer variables a, b, and c to the integer variable maximum?

A) maximum = Math.max (a, b, c);
B) maximum=Math.max (a, b);
maximum= Math.(b, c);
maximum=Math.max (a, c);
C) maximum = Math.max (a, b);
maximum = Math. max (maximum, c);
D) maximum = Math.max (a, b)+ Math.max (b, c)+ Math.max (a, c);

Question 71

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

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

Question 72

What is the output of the following statement sequence?

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

Question 73

What will be the value of the variables x and y after the given set of assignments?

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

Question 74

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

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

Question 75

Which is the mathematical equivalent of the following Java expression?

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

Question 76

Which of the following is the Java equivalent of the following mathematical expression?

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 77

What is result of evaluating the following expression?

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

Question 78

What is the value of the following expression?
3 * 5 / 2 * 5

A)1.5
B)30
C)35
D)37.5

Question 79

A student's class average can be computed by dividing the number of marks they have earned by the number of marks possible.Assume the following variables have been declared as shown and given values elsewhere:
int marksEarned, marksPossible;
double classPercentage;
Which of the following statements will assign the correct percentage average to classPercentage? For example, if marksEarned is 725 and marksPossible is 1000, classPercentage should be assigned the value 72.5.

A)classPercentage = marksEarned / marksPossible * 100.0;
B)classPercentage = 100 * marksEarned / marksPossible;
C)classPercentage = (100.0 * marksEarned) / marksPossible;
D)classPercentage = (100.0 + marksEarned) / marksPossible;

Question 80

Which is a correct representation of the given mathematical expression in Java?

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