Cis 22 Midterm

Front 1

The C# __________________ builds the source code in a C# source file into an executable file.

Back 1

compiler

Front 2

IDE stands for ____________________________ .

Back 2

Integrated Development Environment

Front 3

The ________________ property of a text box lets you prevent the user from entering data into the control.

Back 3

ReadOnly

Front 4

To provide for a user entry, you use a ________________ control.

Back 4

textBox

Front 5

The CancelButton property of a form sets the button that will be activated if the user presses the _________________ key.

Back 5

Esc

Front 6

The properties, methods, and events of a class are called the ___________________ of the class.

Back 6

members

Front 7

When you change the name of a variable in your C# code, Visual Studio will ask whether you want to change all of the other uses of that name through a feature known as _______________.

Back 7

refactoring

Front 8

When you use the methods of the Math class, you don’t create an object from the class. Instead, you use the _____________ methods of the class.

Back 8

static

Front 9

To convert a decimal variable’s data to a string, you can use the _______________ method of the variable.

Back 9

ToString

Front 10

By default, you can assign a null value to a variable that’s a reference type. But to assign a null value to a variable that’s a value type, you need to declare the variable as a _________________.

Back 10

nullable type

Front 11

Write a statement that declares a string variable named cityAndState and assigns a starting value of Cleveland.

Back 11

string cityAndState = "Cleveland";

Front 12

To implement the case structure, you use a/an ______________ statement.

Back 12

switch

Front 13

An object that’s used to connect an event to an event handler is known as a ______________.

Back 13

delegate

Front 14

When an error occurs during the execution of a method, the method ____________ an exception.

Back 14

throws

Front 15

The list of methods that were called before an exception occurred is called the ________________.

Back 15

stack trace

Front 16

To get a description of an exception that has been caught, you can use the exception’s ______________ property.

Back 16

StackTrace or Message

Front 17

If a value that’s assigned to an int variable is too large to be stored in it, a/an ______________ exception occurs.

Back 17

overflow

Front 18

One way to code a method that calls generic methods to test the validity for all of the user entries of a form is to code one ______________ statement for each method call and return a false value if the generic method returns a false value.

Back 18

throw

Front 19

When you use a foreach loop to work with the elements in an array, the statements in the loop are executed once for each __________________ in the array.

Back 19

element

Front 20

A two-dimensional array whose rows can have different numbers of columns is called a/an ____________ array.

Back 20

jagged array

Front 21

When you use a typed collection you are taking advantage of the .NET Framework feature called ____________.

Back 21

generics

Front 22

When compared to untyped collections, typed collections reduce the number of ___________ errors.

Back 22

runtime

Front 23

The difference between a Queue and a Stack collection is that a Queue removes elements on a FIFO basis and a Stack removes them on a/an _____________ basis.

Back 23

LIFO

Front 24

Code the declaration for an array of ints named counts.

Back 24

int[] counts = new int[]

Front 25

Code a statement that creates an array of decimals named miles and assigns the values 27.2, 33.5, 12.8, and 56.4 to its elements.

Back 25

decimal[] miles = {27.2, 33.5, 12.8, 56.4};

Front 26

Given a one-dimensional array named yearlySalesTotals that contains decimal values, code the first line of a foreach statement that will let you access each element in the array in a variable named yearlySalesTotal.

Back 26

foreach (dec yearlySalesTotal in yearlsSalesTotals)

Front 27

Given an array named vendors, code a statement that sorts the elements of the array in alphabetical order.

Back 27

Array.Sort(vendors);

Front 28

Given a typed List collection of int values named dueDays, code a statement that adds the value 120 to the end of the array.

Back 28

dueDays.Add(120);

Front 29

You use the __________________ structure to represent dates and times.

Back 29

DateTime

Front 30

Given an empty StringBuilder object named cn, add this value to it: 2375.

Back 30

cn.Append("2375");

Front 31

The primary components of the .NET Framework are the .NET Framework Class Library and the

a. Command Language Runtime
b. Common Type Library
c. Managed Type Runtime
d. Common Language Runtime

Back 31

d. Common Language Runtime

Front 32

The .NET Framework Class Library consists of
a. solutions that are organized into sublibraries
b. solutions that are organized into namespaces
c. classes that are organized into sublibraries
d. classes that are organized into namespaces

Back 32

d. classes that are organized into namespaces

Front 33

Before a C# application can be run, it must be compiled into a language called
a. Microsoft Common Language
b. Microsoft Intermediate Language
c. Microsoft Runtime Language
d. Microsoft Solution Language

Back 33

b. Microsoft Intermediate Language

Front 34

To write the C# code for a form, you use a Visual Studio window called the
a. Form Designer
b. Solution Explorer
c. Toolbox
d. Code Editor

Back 34

d. Code Editor

Front 35

Two properties that are common to both forms and controls are the
a. Name and AcceptButton properties
b. Name and TabIndex properties
c. Name and Text properties
d. TabIndex and AcceptButton properties

Back 35

c. Name and Text properties

Front 36

The tab order determines the order in which
a. the tabs in the Form Designer window are displayed
b. the user must enter data into the controls on a form
c. the controls on a form receive focus when the user presses the Tab key
d. the controls are displayed on the form

Back 36

c. the controls on a form receive focus when the user presses the Tab key

Front 37

To create an access key that will move the focus to a text box, you
a. set the access key in the Text property of the text box
b. set the access key in the Text property of the label immediately before the text box
c. set the access key in the Text property of the label immediately after the text box
d. set the AccessKey property of the text box

Back 37

a. set the access key in the Text property of the text box

Front 38

When you run a form after you’ve used the Form Designer to design it but haven’t added any code to it,
a. the form is displayed but nothing works
b. the buttons don’t cause anything to happen, but otherwise the form works
c. the form can be compiled but not displayed
d. the form works, but none of the controls work

Back 38

b. the buttons don’t cause anything to happen, but otherwise the form works

Front 39

To refer to a property of an object in your C# code, you code the
a. class name followed by a period and the property name
b. property name followed by a period and the object name
c. object name followed by a period and the property name
d. property name followed by a period and the class name

Back 39

c. object name followed by a period and the property name

Front 40

What does the following code do?
txtMonthlyInvestment.Focus();
a. calls the Focus method of the current form instance
b. calls the Focus method of the txtMonthlyInvestment control
c. calls the txtMonthlyInvestment method of the Focus control
d. calls the () method of the txtMonthlyInvestment.Focus control

Back 40

b. calls the Focus method of the txtMonthlyInvestment control

Front 41

Which of the following is a valid comment?
a. This is a comment
b. ' This is a comment
c. / This is a comment
d. // This is a comment

Back 41

d. // This is a comment

Front 42

When you test an application, your goal is to
a. find runtime errors
b. fix runtime errors
c. find syntax errors
d. fix syntax errors

Back 42

b. fix runtime errors

Front 43

A data tip
a. gives advice on how to set property values
b. displays the value of a variable or property
c. displays the possible values for a property
d. indicates what data will be modified next

Back 43

b. displays the value of a variable or property

Front 44

One common cause of a runtime error is
a. a user entry that can’t be converted to a number
b. a control that has invalid property settings
c. a form that has invalid property settings
d. mispelled keywords in the C# code

Back 44

b. a control that has invalid property settings

Front 45

A constant stores data
a. that changes as a program executes
b. that does not change as a program executes
c. that does not need to be initialized
d. that is a reference type

Back 45

b. that does not change as a program executes

Front 46

Which of the following is a valid decimal literal?
a. 30.0
b. 30.0c
c. 30.0d
d. 30.0m

Back 46

c. 30.0d

Front 47

Variables named according to camel notation
a. capitalize the first letter of every word after the first word
b. use all lowercase letters
c. capitalize the first letter of every word including the first word
d. capitalize only the first letter of the variable name

Back 47

a. capitalize the first letter of every word after the first word

Front 48

decimal a = 2.5m;
decimal b = 4.0m;
decimal c = 12.7m;

int i = 4;
int j = 8;
int k = 17;

What is the value of x after the following statement is executed?
decimal x = Math.Round(c)
a. 0
b. 12
c. 12.7
d. 13

Back 48

b. 12

Front 49

Code Example 4-1

decimal a = 2.5m;
decimal b = 4.0m;
decimal c = 12.7m;

int i = 4;
int j = 8;
int k = 17;

What is the value of x after the following statement is executed?
int x = Math.pow(i, 2);
a. 0
b. 2
c. 4
d. 16

Back 49

d. 16

Front 50

Which statement is equivalent to the following statement?
total = total + tax;
a. total = tax++;
b. total += tax;
c. total = ++tax;
d. total =+ tax;

Back 50

b. total += tax;

Front 51

To override the order of precedence in an arithmetic expression, you can use
a. exclamation points
b. parentheses
c. square brackets
d. curled braces

Back 51

b. parentheses

Front 52

To concatenate two or more strings into one, you use this character:
a. #
b. |
c. &
d. +

Back 52

d. +

Front 53

What is the value of the cityState string after these statements are executed?
cityState = "Milwaukee";
cityState += ",";
cityState = "Wisconsin";
a. Milwaukee, Wisconsin
b. Milwaukee,Wisconsin
c. MilwaukeeWisconsin
d. Wisconsin

Back 53

d. Wisconsin

Front 54

A reference type stores
a. a data value
b. a reference to an object
c. a reference to a string
d. a reference to a class

Back 54

b. a reference to an object

Front 55

Assuming that a variable named sales contains a string that represents a valid decimal number, which of the following statements is valid code for converting the sales string to a decimal value?
a. decimal d = Parse.Decimal(sales);
b. decimal d = Decimal.Parse(sales);
c. decimal d = sales;
d. decimal d = Convert.Decimal(sales);

Back 55

b. decimal d = Decimal.Parse(sales);

Front 56

Assuming total is a decimal variable, which of the following statements does not convert it to a string?
a. string s = "Total: " + total;
b. string s = String.Parse(total);
c. string s = total.ToString();
d. string s = Convert.ToString(total);

Back 56

a. string s = "Total: " + total;

Front 57

If a decimal variable named total has a value of 1234.56, what string will result from the following statement?
string s = total.ToString("c2")
a. $1,234.56
b. 1,234.56
c. 1234.56
d. 1235

Back 57

a. $1,234.56

Front 58

Which of the following data types can’t be used for storing the number 123.4567?
a. double
b. int
c. decimal
d. single

Back 58

b. int

Front 59

A structure is
a. a reference type
b. a value type
c. a primitive type
d. a native type

Back 59

b. a value type

Front 60

Which of the following operators is not a relational operator?
a. =
b. !=
c. >
d. <=

Back 60

a. =

Front 61

Which of the following operators is not a logical operator?
a. !
b. |
c. >
d. &&

Back 61

c. >

Front 62

If you use a short-circuit logical operator to combine two expressions
a. both expressions are always evaluated
b. the second expression is evaluated only if it can affect the result
c. the first expression is evaluated only if it can affect the result

Back 62

b. the second expression is evaluated only if it can affect the result

Front 63

Which of the following statements is not true about if statements?
a. The statements within the braces of a clause have block scope.
b. An if statement can have an unlimited number of else if clauses.
c. Every if statement must include an else clause.
d. You can nest if statements within the if, else if, or else clauses of other if statements.

Back 63

c. Every if statement must include an else clause.

Front 64

Unlike an if-else statement, a switch statement
a. can’t test for a default condition
b. can’t be nested within another switch statement
c. can’t perform an operation based on the result of a boolean expression

Back 64

b. can’t be nested within another switch statement

Front 65

What must you do if you code an infinite loop in an application?
a. Use a counter variable to determine when the loop ends
b. Use a Boolean expression to determine when the loop ends
c. Code just a single statement within the loop
d. Cancel the application to end the loop

Back 65

d. Cancel the application to end the loop

Front 66

If you code a continue statement in a loop, it will cause the application
a. to jump to the beginning of the loop
b. to jump to the end of the loop
c. to enter break mode
d. to jump out of the loop

Back 66

a. to jump to the beginning of the loop

Front 67

When you’re in break mode, you can
a. press F5 to step through the program one statement at a time
b. press F11 to step through the program one statement at a time
c. use the Locals window to review the values of all of the variables that the program uses
d. use the Locals window to review the values of the variables used by the current statement and the four statements before and after it

Back 67

b. press F11 to step through the program one statement at a time

Front 68

The first expression that’s coded within the parentheses in a for loop
a. increments a counter variable
b. decrements a counter variable
c. assigns a starting value to a counter variable
d. tests a Boolean expression

Back 68

c. assigns a starting value to a counter variable

Front 69

In a while loop, the Boolean expression is tested
a. before the loop is executed
b. after the loop is executed
c. both before and after the loop is executed

Back 69

a. before the loop is executed

Front 70

What statement is used to implement the iteration structure?
a. if-else
b. while
c. switch

Back 70

b. while

Front 71

The signature of a method is formed by the
a. name of the method only
b. name of the method and its return type
c. name of the method and its parameter list
d. name of the method, its return type, and its parameter list

Back 71

c. name of the method and its parameter list

Front 72

If you declare a parameter for a method as optional,
a. the user must not provide a value for the parameter
b. the parameter must be assigned a constant value as its default
c. it must be declared before any required parameters
d. the value for the parameter must be passed by name

Back 72

b. the parameter must be assigned a constant value as its default

Front 73

Which of the following is not an advantage of passing arguments by name?
a. You don’t have to indicate if an optional parameter has been omitted
b. You don’t have to know the name of the associated parameter
c. You can pass some arguments by name even if other arguments are passed by position
d. You can pass the arguments in any order

Back 73

b. You don’t have to know the name of the associated parameter

Front 74

To generate an event handler for a control event, you can display the Events list for the control and then
a. select a name from the drop-down list for the event
b. click on the event
c. double-click on the event
d. right-click on the event and select the Generate Handler command

Back 74

c. double-click on the event

Front 75

If you have an int variable named yrs and two decimal variables named prin and rate, which statement can you use to call the method with the following method declaration?
private decimal GetInterest(int years,
decimal interestRate, decimal principle)
a. decimal interest = GetInterest(yrs, rate, prin);
b. decimal interest = GetInterest(rate, prin, yrs);
c. int interest = GetInterest(yrs, rate, prin);
d. int interest = GetInterest(rate, prin, yrs);

Back 75

a. decimal interest = GetInterest(yrs, rate, prin);

Front 76

Which of the following statements would you use to call a private method named InitializeVariables that accepts no parameters and doesn’t return a value?
a. InitializeVariables(void);
b. void InitializeVariables();
c. InitializeVariables();
d. void InitializeVariables(void);

Back 76

b. void InitializeVariables();

Front 77

Which of the following statements would you use to pass a variable named message by reference to a method named DisplayMessage?
a. DisplayMessage(reference message);
b. DisplayMessage(ref message);
c. DisplayMessage(message reference);
d. DisplayMessage(message ref);
e. DisplayMessage(message);

Back 77

b. DisplayMessage(ref message);

Front 78

Which of the following statements would be used to wire the Click event of a button named btnClear to an event handler named ClearControls?
a. this.btnClear.Click += System.EventHandler(this.ClearControls);
b. this.btnClear.Click += new System.EventHandler(this.ClearControls);
c. this.ClearControls += System.EventHandler(this.btnClear.Click);
d. this.ClearControls += new System.EventHandler(this.btnClear.Click);

Back 78

b. this.btnClear.Click += new System.EventHandler(this.ClearControls);

Front 79

Given a text box named txtNum, which of the following statements may cause a format exception?
a. string s = txtNum.Text;
b. if (txtNum.Text == null) newValue = 0;
c. if (txtNum.Text == "") newValue = 0;
d. decimal d = Convert.ToDecimal(txtNum.Text);

Back 79

a. string s = txtNum.Text;

Front 80

To display a dialog box, you can use the Show method of
a. the DialogBox class
b. a DialogBox object
c. the MessageBox class
d. a MessageBox object

Back 80

c. the MessageBox class

Front 81

Two properties of an object created from the Exception class are
a. Message and ToString
b. StackTrace and Name
c. Message and StackTrace
d. Message and Name

Back 81

c. Message and StackTrace

Front 82

In a try-catch statement, the finally block is executed
a. if an exception occurs in the try block
b. if an exception does not occur in the try block
c. if a catch block is executed
d. whether or not an exception occurs or a catch block is executed

Back 82

d. whether or not an exception occurs or a catch block is executed

Front 83

What statement causes a new exception to occur?
a. finally
b. catch
c. throw
d. try-catch

Back 83

c. throw

Front 84

When validating data entered into the text boxes of a form, it is not common to check whether
a. all required entries have been made
b. all text entries are non-numeric
c. all numeric entries can be converted to the appropriate data type
d. all numeric entries fall within a specified range

Back 84

c. all numeric entries can be converted to the appropriate data type

Front 85

An OverflowException can be avoided by a type of data validation known as
a. numeric checking
b. format checking
c. range checking
d. overflow checking

Back 85

c. range checking

Front 86

You may want to code generic methods for data validation because
a. they’re always more efficient
b. they allow you to reuse your data validation code
c. they’re the only way to perform range checking
d. they prevent all exceptions from being thrown

Back 86

b. they allow you to reuse your data validation code

Front 87

To determine the cause of an exception, you can
a. use the name of the exception class that’s displayed
b. use the error message that’s displayed
c. use the information in the stack trace
d. all of the above

Back 87

d. all of the above

Front 88

private void btnCalculate_Click(object sender, System.EventArgs e)
{
decimal weightInPounds = 0m;
try
{
weightInPounds = Convert.ToDecimal(txtPounds.Text);
if (weightInPounds > 0)
{
decimal weightInKilos = weightInPounds / 2.2m;
lblKilos.Text = weightInKilos.ToString("f2");
}
else
MessageBox.Show("Weight must be greater than 0.", "Entry error");
txtPounds.Focus();
}
catch(FormatException)
{
MessageBox.Show("Weight must be numeric.", "Entry error");
txtPounds.Focus();
}
}

If the user enters 118 in the text box and clicks the Calculate button, what does the code do?
a. It calculates the weight in kilograms.
b. It causes a runtime error.
c. It displays a dialog box with the message “Weight must be greater than 0.”
d. It displays a dialog box with the message “Weight must be numeric.”

Back 88

a. It calculates the weight in kilograms.

Front 89

When a statement within a try block causes an exception, the remaining statements in the try block
a. are executed after the statements in the catch block
b. are executed before the statements in the catch block
c. aren’t executed

Back 89

c. aren’t executed

Front 90

When you declare and initialize the values in an array, you are actually creating an instance of what class?
a. String
b. SortedList
c. ArrayList
d. Array

Back 90

d. Array

Front 91

To refer to the ninth element in a one-dimensional array named sales, you code
a. sales[8]
b. sales[9]
c. sales[10]
d. sales.Item(9)

Back 91

a. sales[8]

Front 92

To refer to the second column in the fourth row of a rectangular array named vendors, you code
a. vendors[3,1]
b. vendors[1,3]
c. vendors[4,2]
d. vendors[2,4]

Back 92

a. vendors[3,1]

Front 93

Which of the following statements determines the number of strings in the array that follows?
string[] customers = new string[55];
a. int size = customers.UpperBound;
b. int size = customers.Length;
c. int size = customers.Size();
d. int size = Arrays.Size(customers);

Back 93

b. int size = customers.Length;

Front 94

Which of the following method declarations is valid for a method that accepts an array of strings named customerNames?
a. private string[] ParseCustomerNames(customerNames){}
b. private void ParseCustomerNames(customerNames){}
c. private void ParseCustomerNames(customerNames string[]){}
d. private void ParseCustomerNames(string[] customerNames){}

Back 94

d. private void ParseCustomerNames(string[] customerNames){}

Front 95

You can use the BinarySearch method of the Array class to
a. search for a value in a sorted array and return the index of that value
b. search for a value in an unsorted array and return the index of that value
c. search for a value in a sorted array and return a bool value that indicates if that value was found
d. search for a value in an unsorted array and return a bool value that indicates if that value was found

Back 95

a. search for a value in a sorted array and return the index of that value

Front 96

A queue provides
a. an Item property for getting any item in the collection
b. an Add method for adding an item to the collection
c. a Remove method for removing an item from the collection
d. a Dequeue method for getting the next item in the collection

Back 96

d. a Dequeue method for getting the next item in the collection

Front 97

Which of the following is not true for typed collections?
a. Their classes can be found in the System.Collections.Generic namespace.
b. Trying to add the wrong type of data to one will cause a compile-time error.
c. You need to specify the data type of the collection when you declare it.
d. You need to cast any elements that are retrieved from the collection to the specified data type.

Back 97

d. You need to cast any elements that are retrieved from the collection to the specified data type.

Front 98

If a variable named date contains a valid DateTime value, which of the following statements checks if the date falls in a leap year?
a. bool isLeap = date.IsLeapYear;
b. bool isLeap = date.IsLeapYear();
c. bool isLeap = DateTime.IsLeapYear(date);
d. bool isLeap = DateTime.IsLeapYear(date.Year);

Back 98

d. bool isLeap = DateTime.IsLeapYear(date.Year);

Front 99

Which statement determines the due date for an invoice that is due 45 days after the invoice date?
a. DateTime dueDate = invoiceDate.Add(45);
b. DateTime dueDate = invoiceDate.AddDays(45);
c. DateTime dueDate = invoiceDate.Add(new TimeSpan(45));
d. DateTime dueDate = invoiceDate.Add(DateTime.DAYS, 45);

Back 99

b. DateTime dueDate = invoiceDate.AddDays(45);

Front 100

Which of the following statements refers to the second character in a String object named address?
a. char c = address(1);
b. char c = address(2);
c. char c = address[1];
d. char c = address[2];

Back 100

c. char c = address[1];