Question 1

Case-Based Critical Thinking Questions Case 1 - PetPals
You have been hired by PetPals Veterinary Clinic to modify an application. The application is used to enter and save all patient (pet) information obtained during an office visit.
To simplify the coding of the InputBox function, the prompt and the title for the InputBox can be declared as ____ because they will not change while the application runs.
A) string variables
B) static variables
C) Boolean variables
D) named constants

Accepted Answer

Named constants should be used to declare the prompt and title for InputBox function as they will not change during the application runtime. This makes the code more readable and easier to maintain. Additionally, using static variables or string variables for this purpose would be less efficient and potentially cause errors. Using Boolean variables would not be appropriate in this scenario.

Question 2

A procedure in an application needs to store student data. The student first name, student last name, student GPA, and whether or not the student is registered all need to be stored. Write the appropriate Dim statements to declare the variables. Make sure to use appropriate naming conventions.

Accepted Answer

The answer of A procedure in an application needs to...

Question 3

Case-Based Critical Thinking Questions Case 1 - PetPals
You have been hired by PetPals Veterinary Clinic to modify an application. The application is used to enter and save all patient (pet) information obtained during an office visit.
The veterinarian wants to document and display the name of the technician who performs the initial evaluation of the pet. You decide to use an InputBox function to prompt the user to enter this data first. The InputBox function should be coded in the ____.
A) Save button's Click event procedure
B) form's Load event procedure
C) Print button's Click event procedure
D) Exit button's Click event procedure

Accepted Answer

The form's Load event procedure is the appropriate place to prompt for the technician's name, as it ensures the information is collected as soon as the form is loaded and before any other actions are taken.

Question 4

A procedure in an application needs to store tax rate data. The county of residence and the tax rate need to be stored. Write the appropriate Dim statements to declare the variables. Write an assignment statement that assigns .08 to the tax rate variable.

Accepted Answer

The answer of A procedure in an application needs to...

Question 5

Case-Based Critical Thinking Questions Case 1 - PetPals
You have been hired by PetPals Veterinary Clinic to modify an application. The application is used to enter and save all patient (pet) information obtained during an office visit.
The account number for each pet must be available to be used by all procedures in the form. You should make sure the account number is declared using the ____ keyword.
A) Public
B) Dim
C) Private
D) Val

Accepted Answer

The private keyword is used to declare a variable with a private access modifier, meaning that the variable can only be accessed within the class in which it is declared. Since the account number for each pet must be available to all procedures in the form, it is best to declare it as private to prevent other classes outside the form from accessing and modifying the account number.

Question 6

Explain the scope and lifetime of variables. How are a variable's scope and lifetime determined? List the three scopes available for a variable.

Accepted Answer

The answer of Explain the scope and lifetime of variables....

Question 7

An application translates English words into French words and displays the results as a message in a Label control. The strEnglish variable contains the string "apple". The strFrench variable contains the string "pomme". Write an assignment statement to display the string "The French word for apple is pomme." in the lblMessage control.

Accepted Answer

The answer of An application translates English words into French...

Question 8

What are the Convert class methods and why are they sometimes used instead of conversion functions?

Accepted Answer

The answer of What are the Convert class methods and...

Question 9

A local gym needs an application to apply a 10% discount for all new members who present a coupon during enrollment. Write the statements to declare a variable to record if a customer has a coupon, and to assign the discount rate. The discount rate will not change while the application is running.

Accepted Answer

The answer of A local gym needs an application to...

Question 10

An application allows a user to enter an employee code, a salary amount, and a bonus rate to be used in a calculation. The salary amount will always be a whole number, and the bonus rate may contain a decimal place. Write the appropriate Dim statements to declare the variables. Write the related statements needed to convert the strings entered by the user into numeric data types.

Accepted Answer

The answer of An application allows a user to enter...

Question 11

A procedure in an application needs to store data used to calculate the total price of purchasing tires. The price of the tires will contain a decimal place. The number of tires will always be a whole number. Write the appropriate Dim statements to declare the variables. Make sure to use appropriate naming conventions.

Accepted Answer

The answer of A procedure in an application needs to...

Question 12

An application allows a user to enter an item price and a quantity to be used in a calculation. The item price may contain a decimal place, and the quantity will always be a whole number. Write the appropriate Dim statements to declare the variables. Write the related statements needed to convert the strings entered by the user into numeric data types.

Accepted Answer

The answer of An application allows a user to enter...

Question 13

The decBalance variable contains the number 1368.52. Write the assignment statement to display the value with a dollar sign, a thousands separator, and two decimal places in the lblBalance control.

Accepted Answer

The answer of The decBalance variable contains the number 1368.52....

Question 14

Problems - Correcting Code Errors 
The following sample of code contains errors. Rewrite the incorrect statements to correct all errors. 
Private Sub btnCalc_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnCalc.Click 
' calculates and displays the total amount owed for purchasing hats 
' user enters number of hats and price per hat 
' all hats are on sale for 25% off the price 
Dim dblNumHats As Integer 
Dim decHatPrice As Decimal 
Dim decDiscount As Double 
Dim decTotal As Decimal 
' assign number of hats and price to variables 
Integer.TryPurse(txtNumHats.Text, intNumHats) 
Decimal.TryParse(txtHatPrice, decHatPrice) 
' calculate and display the total amount owed 
decDiscount = decHatPrice * dblRATE 
decTotal = (intNumHats + decHatPrice) - decDiscount 
Total.Text = decTotal.ToString(C2) 
End Sub

Accepted Answer

The answer of Problems - Correcting Code Errors 
The following...

Question 15

What is a static variable? How is it different from a class-level variable?

Accepted Answer

The answer of What is a static variable? How is...

Question 16

The decRate variable contains the number .03. Write the assignment statement to display the value as 3% in the lblRate control.

Accepted Answer

The answer of The decRate variable contains the number .03....

Question 17

What is a TextChanged event? How can it be used within an application?

Accepted Answer

The answer of What is a TextChanged event? How can...

Question 18

Write a statement to display an input dialog box that shows "Car Make:" as the prompt, "Car" in the title bar, and an empty input area. When the user closes the dialog box, the assignment statement assigns the function's return value to the strCar variable.

Accepted Answer

The answer of Write a statement to display an input...

Question 19

The Decimal, Double, and Single variable data types can all store what type of numeric data?  Explain the differences among these three data types and problems that can occur with their use.

Accepted Answer

The answer of The Decimal, Double, and Single variable data...

Question 20

Problems - Correcting Code Errors 
The following sample of code contains errors. Rewrite the incorrect statements to correct all errors. 
Dim strPROMPT As String = "Please enter an employee code:" 
Const strTITLE As String = Employee Data 
'assign the code to a variable 
strCode = InputBox(strTITLE, strPROMPT)

Accepted Answer

The answer of Problems - Correcting Code Errors 
The following...

Quiz 3: Using Variables and Constants

A procedure in an application needs to store student data. The student first name, student last name, student GPA, and whether or not the student is registered all need to be stored. Write the appropriate Dim statements to declare the variables. Make sure to use appropriate naming conventions.

A procedure in an application needs to store tax rate data. The county of residence and the tax rate need to be stored. Write the appropriate Dim statements to declare the variables. Write an assignment statement that assigns .08 to the tax rate variable.

Explain the scope and lifetime of variables. How are a variable's scope and lifetime determined? List the three scopes available for a variable.

What are the Convert class methods and why are they sometimes used instead of conversion functions?

A local gym needs an application to apply a 10% discount for all new members who present a coupon during enrollment. Write the statements to declare a variable to record if a customer has a coupon, and to assign the discount rate. The discount rate will not change while the application is running.

The decBalance variable contains the number 1368.52. Write the assignment statement to display the value with a dollar sign, a thousands separator, and two decimal places in the lblBalance control.

What is a static variable? How is it different from a class-level variable?

The decRate variable contains the number .03. Write the assignment statement to display the value as 3% in the lblRate control.

What is a TextChanged event? How can it be used within an application?

Write a statement to display an input dialog box that shows "Car Make:" as the prompt, "Car" in the title bar, and an empty input area. When the user closes the dialog box, the assignment statement assigns the function's return value to the strCar variable.

The Decimal, Double, and Single variable data types can all store what type of numeric data? Explain the differences among these three data types and problems that can occur with their use.