Question 1

What value is assigned to the variable strSnip when the following statements execute? Dim strSnip As String Dim strFullString As String = "Washington" StrSnip = strFullString.Substring(7)

Accepted Answer

The Substring method starts at the specified character position and continues to the end of the string. In this case, the starting position is 7, so it will include all the characters after the 7th position, which are "ton".

Question 2

If the Boolean expression A is True and B is False, the value of the logical expression A And B is __________.

Accepted Answer

In the logical operator "AND", if either one of the operands is False, the result will always be False. Therefore, the answer is False (or letter B).

Question 3

What value is assigned to decTaxes by the following program segment, assuming that the user enters 50000 into the textbox txtSalary.Text? Dim decSalary, decTaxes As Decimal DecSalary = CDec (txtSalary.Text) If (decSalary > 50000) Then DecTaxes = .40 * decSalary ElseIf (decSalary > 40000) Then DecTaxes = .30 * decSalary ElseIf (decSalary > 30000) Then DecTaxes = .20 * decSalary Else DecTaxes = .10 * decSalary End If

Accepted Answer

Since the salary entered is 50000, it falls into the condition "ElseIf (decSalary > 40000)" which assigns decTaxes as 0.30 * 50000, resulting in 15000.

Question 4

What value will be assigned to intIndex when the following statements execute? Dim strTarget As String = "asdsakfljfdgasldfjdl" Dim intIndex = strTarget.IndexOf("as", 1, 10)

Accepted Answer

The IndexOf method searches for the substring "as" starting from index 1 up to 10 characters, but "as" does not appear in that range, so it returns -1.

Question 5

What value will be assigned to intIndex when the following statements execute? Dim strTarget As String = "asdsakfljfdgasldfjdl" Dim intIndex = strTarget.IndexOf("as", 1)

Accepted Answer

The `IndexOf` method in the given code searches for the substring "as" starting from index 1 in the string "asdsakfljfdgasldfjdl". The first occurrence of "as" after index 0 is at index 12, hence the value assigned to `intIndex` is 12.

Question 6

Because only one radio button in a group can be selected at any given time, they are said to be _________.

Accepted Answer

Radio buttons are mutually exclusive because only one option can be selected at a time, and selecting one option automatically unselects the others in the same group.

Question 7

What is assigned to lblMessage.Text when the following code segment executes? Dim strName1 As String = "Jim" Dim strName2 As String = "John" If strName1 > strName2 Then LblMessage.Text = "Jim is greater" Else LblMessage.Text = "John is greater" End If

Accepted Answer

Since "J" in "John" has a greater ASCII value compared to "J" in "Jim", the condition `strName1 > strName2` will evaluate to false. Therefore, the code inside the else block will execute and assign "John is greater" to LblMessage.Text.

Question 8

What value is assigned to the variable strSnip when the following statements execute? Dim strSnip As String Dim strFullString As String = "Washington" StrSnip = strFullString.Substring(1, 3)

Accepted Answer

The Substring method in VB.NET starts at a specified character position and continues for a specified number of characters. Here, it starts at position 1 (0-based indexing, so the second character) and extracts 3 characters, resulting in "ash" from "Washington".

Question 9

A flag is a ______variable that signals when some condition exists in the program.

Accepted Answer

A flag variable is a Boolean variable that is used to indicate the presence or absence of a condition in the program. It can have two values: true or false, representing the presence or absence of the condition respectively. Local and class-level variables do not necessarily imply a flag variable, and the term "standard variable" is not commonly used in programming.

Question 10

To convert a copy of a string to all uppercase letters, use the method of the String object.

Accepted Answer

The method ToUpper is specifically designed to convert a copy of a string to all uppercase letters. The other choices do not have this functionality.

Question 11

Suppose you want to verify that the user has entered a value into a text box named txtInput. Which of the following code segments responds with an appropriate message if the user does not enter a value?

Accepted Answer

Choice D checks if the value of txtInput.Text is equal to String.Empty, which means it is empty or no value has been entered. This is the correct way to check for an empty input in a text box. Choice A also checks for non-empty input, but using the "< >" operator is not recommended as it can lead to unexpected behavior. Choice B checks for a space character which may not be the same as an empty input. Choice C also checks for non-empty input but using the "< >" operator instead of the ".Text" property is incorrect.

Question 12

Which function accepts a string as its argument and returns True if the string contains only numeric digits?

Accepted Answer

The IsNumeric function accepts a string as its argument and returns True if the string contains only numeric digits or a numeric value (including decimal points, commas, and currency symbols). The IsNumber function does not exist in VBScript. CStr and ToString are functions used for converting data types.

Question 13

The first character in a string has an index of .

Accepted Answer

The index of the first character in a string is always 0. The index of the last character in a string is the length of the string minus 1.

Question 14

The _keyword is required to use relational operators in a Case statement.

Accepted Answer

The "Is" keyword is required to use relational operators in a Case statement in programming languages like Visual Basic. It allows for comparisons beyond simple equality.

Question 15

Suppose you want to determine whether a variable, decPayAmount, is between 1200 and 1400, inclusively. If it is, you want to set lblMessage text to "Pay amount is in the range". Which of the following code segments will accomplish this?

Accepted Answer

Option C correctly sets the condition for the variable to be in the range of 1200 and 1400 inclusively. The logical operator && (And) is used to combine the two conditions that the variable must be greater than or equal to 1200 and less than or equal to 1400. If the condition is true, then the message "Pay amount is in the range" is displayed in the label lblMessage. Option A uses the wrong logical operator (<= instead of >=) and reverses their order, and option B uses the wrong logical operator (<= instead of >=), and reverses the order of the conditions as well. Option D also uses the wrong logical operator and reverses their order.

Question 16

If the Boolean expression A is True and B is False, the value of the logical expression A Or B is __________.

Accepted Answer

The logical operator 'Or' returns a True output if at least one of the inputs is True. In this case, A is True, so the output will be True regardless of the value of B.

Question 17

What value is assigned to decTaxes by the following program segment, assuming that the user enters 30000 into the textbox txtSalary.Text? Dim decSalary, decTaxes As Decimal DecSalary = CDec(txtSalary.Text) If (decSalary > 50000) Then DecTaxes = .40 * decSalary ElseIf (sngSalary > 40000) Then DecTaxes = .30 * decSalary ElseIf (sngSalary > 30000) Then DecTaxes = .20 * decSalary Else DecTaxes = .10 * decSalary End If

Accepted Answer

Since the salary entered is 30000, it does not meet any of the conditions for higher tax brackets and falls into the "Else" category, which assigns decTaxes as .10 * decSalary, resulting in 3000.

Question 18

Which of the following code segments assigns the string "Great Year" to the Text property of a label named lblMessage when the value in the variable decSales is either greater than 50,000 or equal to 50,000?

Accepted Answer

The condition for the if statement should be decSales >= 50000 to cover both cases where the value in the variable is greater than or equal to 50,000. The assignment statement sets the text of the label to "Great Year" when the condition is true. Options A, C, and D have incorrect operators or conditions.

Question 19

Which statement assigns the string strAddress to label lblAddress while removing only trailing spaces?

Accepted Answer

Option D is correct because the method `TrimEnd()` is used to remove trailing spaces from the end of a string, which matches the requirement.

Question 20

What value will be assigned to intIndex when the following statements execute? Dim strTarget As String = "asdsakfljfdgasldfjdl" Dim intIndex as Integer = strTarget.IndexOf("GAS")

Accepted Answer

Since "GAS" is not found in the string "strTarget", the value assigned to intIndex will be -1.

Quiz 4: Making Decisions

What value is assigned to the variable strSnip when the following statements execute? Dim strSnip As String Dim strFullString As String = "Washington" StrSnip = strFullString.Substring(7)