Question 1

Which statement is true in regard to passing an argument by value to a procedure?
A) A copy of the argument is passed to the procedure.
B) A reference to the argument is passed to the procedure.
C) The procedure has access to the original argument and can make changes to it.
D) A procedure's parameter list need not agree with the arguments provided to the procedure.

Accepted Answer

When passing an argument by value, a copy of the argument's value is passed to the procedure. This means any changes made to the parameter inside the procedure do not affect the original argument outside of the procedure.

Question 2

When calling a procedure, passed arguments and declared parameters must agree in all of the following ways except __________.
A) the order of arguments and parameters must correspond
B) the names of the arguments and parameters must correspond
C) the types of the arguments and parameters must correspond
D) the number of arguments and the number of parameters must be the same

Accepted Answer

The names of the arguments and parameters do not need to correspond when calling a procedure. What matters is the order, type, and number of arguments and parameters, ensuring they match the procedure's definition.

Question 3

By writing your own procedures, you can ______an applications code, that is, break it into small, manageable procedures.
A) streamline
B) duplicate
C) modularize
D) functionalize

Accepted Answer

Modularizing an application's code means breaking it down into smaller, more manageable modules or procedures. This makes the code easier to read, understand, and maintain, as each procedure can be tested, optimized, and documented separately. Streamlining or optimizing the code is a related concept, but it refers more to reducing the number of steps or improving the efficiency of the existing procedures, rather than organizing the code into modules. Duplicating code is generally considered a bad practice, as it can lead to inconsistencies, errors, and redundant code. Functionalizing code is not a commonly used term in programming, and it is not related to modularization.

Question 4

If we were to call the MakeDouble and ChangeArg methods shown below, using the following statements, what value would be assigned to lblResult.Text? Dim intValue As Integer = 20 ChangeArg(intValue) LblResult.Text = MakeDouble(intValue).ToString() Function MakeDouble (ByVal intArg As Integer) As Integer Return intArg * 2 End Function Sub ChangeArg2(ByRef intArg As Integer) ' Display the value of intArg. LstOutput.Items.Add(" ") LstOutput.Items.Add("Inside the ChangeArg procedure, " & "intArg is " & intArg.ToString()) LstOutput.Items.Add("I will change the value of intArg.") ' Assign 0 to intArg. IntArg = 0 ' Display the value of intArg. LstOutput.Items.Add("intArg is now " & intArg.ToString()) LstOutput.Items.Add(" ") End Sub A) 0 B) 20 C) 40 D) (cannot be determined)

Accepted Answer

The answer of If we were to call the MakeDouble...

Question 5

Which debugging command executes a function call without stepping through function's statements?
A) Step Into
B) Step Over
C) Step Out
D) Step All

Accepted Answer

The "Step Over" command executes the current function call without stepping through the function's individual statements. This allows the debugger to quickly move to the next line of code in the current function or method, which can be much faster than stepping through each individual statement.

Question 6

A is a special variable that receives a value being passed into a procedure or function.
A) temporary variable
B) pseudo-constant
C) class-level variable
D) parameter

Accepted Answer

A is a parameter, as it is a variable used to pass a value into a procedure or function. Parameters are used to customize the behavior of a function or procedure, allowing it to operate on different inputs.

Question 7

What is the value of intTotal after the following code executes? Dim intNumber1 As Integer = 2 Dim intNumber2 As Integer = 3 Dim intTotal As Integer IntTotal = AddSquares(intNumber1, intNumber2) Function AddSquares(ByVal intA As Integer, ByVal intB As Integer) As Integer IntA = intA * intA IntB = intB * intB Return intA + intB IntA = 0 IntB = 0 End Function A) 0 B) 5 C) 10 D) 13

Accepted Answer

The code defines two integer variables, intNumber1 and intNumber2, and sets their values to 2 and 3 respectively. It then declares a third integer variable, intTotal, without assigning it a value.
Next, the code calls the AddSquares function, passing intNumber1 and intNumber2 as arguments. Inside the function, the values of intA and intB are squared (4 and 9 respectively), added together (13) and this result is returned.
The returned value, 13, is then assigned to intTotal. Therefore, the value of intTotal after the code executes is 13.

Question 8

All of the following are true about functions except __________.
A) you can use a function call in an expression
B) they can return one or more values
C) they must contain at least one Return statement
D) you can assign the return value from a function to a variable

Accepted Answer

The answer of All of the following are true about...

Question 9

In the context of Visual Basic procedures and functions, what is an argument?
A) A value received by a procedure from the caller
B) A value passed to a procedure by the caller.
C) A local variable that retains its value between procedure calls.
D) A disagreement between the procedure and the statement that calls it.

Accepted Answer

An argument is a value passed to a procedure by the caller. It is used in the procedure as a parameter to perform a particular task.

Question 10

What is assigned to lblDisplay.Text when the following code executes? Dim intNumber As Integer = 4 AddOne(intNumber, 6) LblDisplay.Text = intNumber ' Code for AddOne Public Sub AddOne(ByVal intFirst As Integer, ByVal intSecond As Integer) IntFirst += 1 IntSecond += 1 End Sub A) 4 B) 5 C) 6 D) 7

Accepted Answer

The integer variable "intNumber" is assigned the value of 4. The AddOne function takes two integer parameters and increments them by 1, but does not return any value. Therefore, the value of "intNumber" remains 4 and is assigned to lblDisplay.Text, resulting in the display of "4".

Question 11

Which of the following does not apply to procedures and functions?
A) they help to break up a large body of code into smaller chunks
B) they make it easier to maintain and modify code
C) the execution time is significantly reduced by calling procedures and functions
D) they permit the same sequence of code statements to be called from multiple places

Accepted Answer

Procedures and functions may not necessarily reduce the execution time significantly. They primarily help with code organization, reusability, maintainability, and modularity.

Question 12

A procedure may not be accessed by procedures from another class or form if the ______access specifier is used.
A) Private
B) Public
C) Static
D) Scope

Accepted Answer

Private access specifier restricts access to the procedure only within the same class or form, and not accessible from outside the class or form.

Question 13

When a procedure finishes execution, __________.
A) control returns to the point where the procedure was called and continues with the next statement
B) the application terminates unless the procedure contains a Return statement
C) control transfers to the next procedure found in the code
D) the application waits for the user to trigger the next event

Accepted Answer

When a procedure finishes execution, control returns to the point in the main program where the procedure was called, and continues with the next statement after the procedure call.

Question 14

What is incorrect about the following function? Function sum(ByVal intX As Integer, ByVal intY As Integer) As Integer Dim intAns As Integer IntAns = intX + intY End Function A) intAns should not be declared inside the Function. B) the as Integer at the end of the Function heading should be eliminated. C) the function does not return a value D) parameters intA and intB should be declared as ByRef

Accepted Answer

The function does not have a return statement or value, which is essential for a function.

Question 15

When a parameter is declared using the ______qualifier, the procedure has access to the original argument variable and may make changes to its value.
A) ByValue
B) ByAddress
C) ByRef
D) ByDefault

Accepted Answer

ByRef qualifier is used when a procedure needs to access and modify the original value of an argument. It allows the procedure to work directly with the memory location of the argument variable, rather than creating a copy of the value. This can be useful for improving performance and reducing memory usage, as well as for allowing the procedure to make changes to the original data.

Question 16

Which of the following examples correctly uses an input box to assign a value to an integer, and returns the integer to the calling program using a reference parameter?
A) Sub GetInput(ByVal intNumber As Integer) intNumber = CInt(InputBox("Enter an Integer"))
End Sub

B) Sub GetInput(ByRef intNumber As Integer) intNumber = CInt(InputBox("Enter an Integer"))
End Sub

C) Sub GetInput(ByRef intNumber As Integer) intNumber = CInt(InputBox("Enter an Integer"))
Return intNumber
End Sub

D) Sub GetInput() Dim intNumber As Integer
IntNumber = CInt(InputBox("Enter an Integer"))
End Sub

Accepted Answer

In option B, the ByRef keyword is used to pass the integer variable as a reference parameter. This means that any changes made to the variable inside the subroutine will be reflected outside the subroutine as well. The input value is assigned to the integer variable using the InputBox function and returned to the calling program through the reference parameter. This is the correct way to assign a value to an integer through an input box and return the value to the calling program.

Question 17

Which of the following functions accepts a parameter named dblSales and returns the commission to the calling statement? Assume that the commission should equal the sales multiplied by the commission rate. Use the following table as a guide to the calculation of the commission rate. 
A)
B) 
C) 
D)

Accepted Answer

The answer of Which of the following functions accepts a...

Question 18

Which of the following calls to the GetNumber procedure is not valid? Sub GetNumber(ByVal intNumber as Integer) ' (procedure body) End Sub A) GetNumber(intX) B) GetNumber(3 + 5 * 8 + intX) C) GetNumber(intX + 3, intY) D) GetNumber(CInt(txtNumber.Text))

Accepted Answer

The GetNumber procedure only accepts one integer parameter, but choice C has two parameters passed to it.

Question 19

When debugging a program in break mode, the Step Into command causes the currently highlighted line of code to execute.

Accepted Answer

This is true. The Step Into command allows you to execute one line of code at a time, and it will pause at each line, letting you see how the program is executing.

Question 20

Which of the following code examples is a function that will accept three integer parameters, calculate their average, and return the result?
A) Function Average(ByVal intX As Integer, ByVal intY As Integer, _ 
ByVal intZ As Integer) As Single
Average = (intX + intY + intZ) / 3
End Function

B) Function Average(ByVal intX As Integer, ByVal intY as Integer, _ 
ByVal intZ As Integer) As Single
Average = intX + intY + intZ / 3
Return Average
End Function

C) Function Average(ByRef intX As Integer, ByRef intY as Integer, _ 
ByRef intZ As Integer, ByRef Average As Double)
Average = (intX + intY + intZ) / 3
End Function

D) Function Average(ByVal intX As Integer, ByVal IntY as Integer, _ 
ByVal intZ As Integer) As Single
Return (intX + intY + intZ) / 3
End Function

Accepted Answer

Option D is the correct function as it accepts three integer parameters and returns the calculated average without any unnecessary use of ByRef or incorrect syntax.

Quiz 6: Procedures and Functions

Which statement is true in regard to passing an argument by value to a procedure?

When calling a procedure, passed arguments and declared parameters must agree in all of the following ways except __________.

By writing your own procedures, you can ______an applications code, that is, break it into small, manageable procedures.

Which debugging command executes a function call without stepping through function's statements?

A is a special variable that receives a value being passed into a procedure or function.

All of the following are true about functions except __________.

In the context of Visual Basic procedures and functions, what is an argument?

What is assigned to lblDisplay.Text when the following code executes? Dim intNumber As Integer = 4 AddOne(intNumber, 6) LblDisplay.Text = intNumber ' Code for AddOne Public Sub AddOne(ByVal intFirst As Integer, ByVal intSecond As Integer) IntFirst += 1 IntSecond += 1 End Sub

Which of the following does not apply to procedures and functions?

A procedure may not be accessed by procedures from another class or form if the ______access specifier is used.

When a procedure finishes execution, __________.

What is incorrect about the following function? Function sum(ByVal intX As Integer, ByVal intY As Integer) As Integer Dim intAns As Integer IntAns = intX + intY End Function

When a parameter is declared using the ______qualifier, the procedure has access to the original argument variable and may make changes to its value.

Which of the following examples correctly uses an input box to assign a value to an integer, and returns the integer to the calling program using a reference parameter?

Which of the following functions accepts a parameter named dblSales and returns the commission to the calling statement? Assume that the commission should equal the sales multiplied by the commission rate. Use the following table as a guide to the calculation of the commission rate.

Which of the following calls to the GetNumber procedure is not valid? Sub GetNumber(ByVal intNumber as Integer) ' (procedure body) End Sub

When debugging a program in break mode, the Step Into command causes the currently highlighted line of code to execute.

Which of the following code examples is a function that will accept three integer parameters, calculate their average, and return the result?