(4-5)

Question 1

In the for loop, the control variable cannot be initialized to a constant value and tested against a constant value

Answer 1

False

Question 2

What will the value of x after the following code is executed?

int x = 10;
while (x < 100)
{
x += 10;
}

Answer 2

100 (check answer)

Question 3

A for loop normally performs which of these steps

Answer 3

update the control variable during each iteration
test the control variable by comparing it to a maximum/minimum value and terminate when it reaches that value

Answer - all of the above

Question 4

What will be the value of x after the following code is executed?

int x = 10;
for (int y = 5; y < 20; y += 5)
x += y;

Answer 4

40

Question 5

This a control statement that causes a statement or a group of statements to repeat

Answer 5

Loop

Question 6

In all but rare cases, loops must contain within themselves:

Answer 6

a way to terminate

Question 7

Assume that inputFile references a Scanner object that was used to open a file. Which of the following while loops shows the correct way to read data from the file until the end of the file is reached?

Answer 7

while (inputFile.hasNext())

Question 8

How many times will the following for loop be executed?

for (int count = 10; count <= 21; count ++)
System.out.println(“Java is great”);

Answer 8

12 (check answer)

Question 9

What will be the value of x after the following code is executed?

int x, y = 15, z = 3;
x = (y - -) / (++z);

Answer 9

3

Question 10

What will be the values of x and y as a result of the following code?

int x = 12, y = 5;
x += y- -;

Answer 10

x = 17, y = 4

Question 11

What will be the value of x after the following code is executed?

int x = 10, y = 20;
while (y < 100)
{
x += y;
y += 20;
}

Answer 11

210

Question 12

In the following code, what values could be read into number to terminate the while loop?

Scanner keyboard = new Scanner(System.in);
System.out.println(“Enter a number “);
int number = keyboard.nextInt();
while (number < 100 && number > 500)
{
System.out.print(“Enter another number “);
number = keyboard.nextInt();
}

Answer 12

The boolean condition can never be true

Question 13

A file must always be opened before using it and closed when the program is finished using it

Answer 13

True

Question 14

This type of loop is ideal in situations where the exact number of iterations is known

Answer 14

for loop

Question 15

What will be the values of x and y as a result of the following code?

int x = 25, y = 8;
x += y++;

Answer 15

x = 33, y = 9 (check answer)

Question 16

Which of the following are pre-test loops?

Answer 16

While and for

Question 17

When the break statement is encountered in a loop, all the statements in the body of the loop that appear after it are ignored, and the loop prepares of the next iteration

Answer 17

False

Question 18

__________ is the process of inspecting data given to the program by the user and determining if it is valid

Answer 18

Input validation

Question 19

What will be the value of x after the following code is executed?

int x = 10;
while (x < 100);
{
x +=10;
}

Answer 19

This is an infinite loop

Question 20

What will be the value of x after the following code is executed?

int x = 10, y = 20;
while (y < 100)
{
x+= y;
}

Answer 20

This is an infinite loop

Question 21

Assuming that inputFile references a Scanner object that was used to open a file, which of the following statements will read an int from the file?

Answer 21

int number = inputFile.nextInt();

Question 22

The while loop has two important parts: (1) the boolean expression that is tested for a true or false value, and (2) a statement or a block of statements that is repeated as long as the expression is true

Answer 22

True

Question 23

Each repetition of a loop is known as what?

Answer 23

Iteration

Question 24

In the following code, what values could be read into number to terminate the while loop?

Scanner keyboard = new Scanner(System.in);
System.out.println(“Enter a number “);
int number = keyboard.nextInt();
while (number < 100 || number > 500)
{
System.out.println(“Enter another number: “);
keyboard.nextInt();
}

Answer 24

Numbers in the range 100 - 500

Question 25

When using the PrintWriter class, which of the following import statements would you write near the top of your program?

Answer 25

import java.io.*;

Question 26

You can use this method to determine whether a file exists

Answer 26

The file class's exist method

Question 27

If you are using a block of statements, don't forget to enclose all of the statements in a set of:

Answer 27

Braces

Question 28

This type of loop allows the user to decide the number of iterations

Answer 28

user controlled loops

Question 29

When you pass the name of a file to the PrintWriter constructor, and the file is already exists, it will be erased and a new empty file with the same name will be created.

Answer 29

True

Question 30

What will be printed after the following code is executed? for (int number = 5; number <= 15; number += 3) System.out.println(number + " , ");

Answer 30

5, 8, 11, 14

Question 31

If a loop does not contain within itself a way to terminate, it is called a(n)

Answer 31

infinite loop

Question 32

Java provides a set of simple unary operators designed just for incrementing and decrementing variables

Answer 32

True

Question 33

A loop that executes as long as a particular condition exists is called a(n)

Answer 33

conditional loop

Question 34

This is a sum of numbers that accumulates with each iteration of a loop

Answer 34

Running total

Question 35

When you open a file with the PrintWriter class, the class can potentially throw an IOException

Answer 35

True

Question 36

In a for statement, the control variable can only be incremented

Answer 36

False

Question 37

Before entering a loop to compute a running total, the program should first do this:

Answer 37

Set the accumulator variable to an initial value, usually zero

Question 38

The increment operator is:

Answer 38

++

Question 39

A loop that repeats a specific number of times is known as a(n)

Answer 39

Count controlled

Question 40

Assume that the following method header is for a method in class A. public void displayValue(int value) Assume that the following code segments appear in another method, also in class A. Which contains a legal call to the displayValue method?

Answer 40

int x = 7; displayValue(x);

Question 41

In a general sense, a method is:

Answer 41

A collection of statements that performs a certain task

Question 42

Any method that calls a method with a throws clause in its header must:

Answer 42

handle the potential exception have the same throws clause Answer - both of these

Question 43

A value-returning method must specify this as its return type in the header

Answer 43

any valid data type

Question 44

Two general categories of methods are void methods and value returning methods

Answer 44

True

Question 45

Constants, variables, and the values of expressions may be passed as arguments to a method

Answer 45

True

Question 46

Values that are sent into a method are called:

Answer 46

Arguments

Question 47

A parameter's variable scope is:

Answer 47

The method in which the parameter is declared (check)

Question 48

Which of the following values can be passed to a method that has an int parameter variable?

Answer 48

None of the above

Question 49

When you pass an argument to a method, be sure that the argument's data type is compatible with:

Answer 49

The parameter variable's data type

Question 50

A special variable that holds a value being passed into a method is called what?

Answer 50

Parameter

Question 51

What will be the result of the following code? int num; string str = "555"; num = Integer.parseInt(String str) + 5;

Answer 51

The last line of the code will cause an error

Question 52

This part of a method is a collection of statements that are performed when the method is executed

Answer 52

Method body

Question 53

What will be returned from the following method? public static int methodA() { double a = 8.5 + 9.5; return a; }

Answer 53

This is an error

Question 54

Which of the following is NOT part of a method call?

Answer 54

Return type

Question 55

Given the following method header, which of the methods calls would be an error? public void displayValues(int x, int y)

Answer 55

displayValue(a, b) where a is a short and b is a long

Question 56

Local variables can be initialized with:

Answer 56

constants parameter values the results of an arithmetic operator Answer - any of these

Question 57

This type of method performs a task then terminates

Answer 57

Void

Question 58

Methods are commonly used to:

Answer 58

Break a problem down into small manageable pieces

Question 59

Any method that calls a method with a throws clause in its header must either handle the potential exception or have the same throws clause

Answer 59

True

Question 60

A value-returning method can return reference to a non-primitive type

Answer 60

True

Question 61

In the following code System.out.println(num) is an example of: double num = 5.4; System.out.println(num); num = 0.0;

Answer 61

A void method

Question 62

This type of method performs a task and sends a value back to the code that called it.

Answer 62

Value-returning

Question 63

Which of the following would be a valid method call for the following method? public static void showProduct(double num1, int num2) { double product; product = num1 * num2; System.out.println("The product is " + product); }

Answer 63

showProduct(3.3, 55);

Question 64

In the method header the static method modifier means the method is available to code outside the class

Answer 64

False

Question 65

If you attempt to use a local variable before it has been given a value:

Answer 65

A compiler error will occur

Question 66

If method A calls method B, and method B calls method C, and method C calls method D, when method D finishes, what happens?

Answer 66

Control is returned to method C

Question 67

When an argument value is passed to a method, the receiving parameter variable is:

Answer 67

Declared in the method header inside the parentheses

Question 68

The header of a value-returning method must specify this:

Answer 68

The data type of the return type

Question 69

No statement outside the method in which a parameter variable is declared can access the parameter by its name

Answer 69

True

Question 70

Breaking a program down into small manageable methods:

Answer 70

Makes problems more easily solved Allows for code reuse Simplifies programs Answer - all of the above

Question 71

You must have a return statement in a value-returning method

Answer 71

True

Question 72

Which of the following is NOT a benefit derived from using methods in programming?

Answer 72

Problems are more easily solved Simplifies programs Code reuse Answer - all of these are benefits

Question 73

You should always document a method by writing comments that appear:

Answer 73

Just before the method's definition

Question 74

Which of the following is included in a method call?

Answer 74

Parentheses

Question 75

Methods are commonly used to:

Answer 75

Break a problem down into small manageable pieces

Question 76

What is wrong with the following method call? displayValue (double x);

Answer 76

Do not include the data type in the method call

Question 77

When a method tests an argument and returns a true or false value, it should return:

Answer 77

A boolean value

Question 78

Methods are commonly used to break a problem into small, manageable pieces

Answer 78

True

Question 79

Which of the following would be a valid method call for the following method? public static void showProduct(int num1, double num2) { int product; product = num1 * int(num2); System.out.println("The product is" + product); }

Answer 79

showProduct(10, 4.5);

Question 80

What will be returned from the following method? public static double methodA() { double a = 8.5 + 9.5; return a; }

Answer 80

18.0