Exam 10: Structures and Sequential Access Files

An application contains the Structure statement shown below: Structure Furniture Public strStyle As String Public decPrice As Decimal End Structure Write a Dim statement that declares a Furniture variable named sofas . Then, write assignment statements that assign the value "Sectional" to the strStyle member, and assign the number 1895.99 to the decPrice member.

An application contains the Structure statement shown below: Structure SalonInfo Public strService As String Public intRate As integer End Structure Write a Dim statement that declares an eight-element one-dimensional array of SalonInfo variables. Name the array mySalonInfo . Write the code to store the following data in the array:

Case-Based Critical Thinking Questions Case 1 - Frames Unlimited Frames Unlimited is a wholesale picture and poster frame business. Frame data is stored in sequential access files that contain four columns: item number, item name, size, and price. An application uses the posterFrame.txt sequential access file to display all of the poster frames in a list box. You need to use the list box to select and remove any poster frames that are 16x20. Which of the following statements determines if a line is selected in the list box?

Which of the following statements will close the sequential access file associated with the outFile variable?

Which of the following statements will read data from a sequential access file?

Write the statement that would write two columns of text to an output file named outFile . The first column, which contains the data for the strStudentID variable, must contain nine characters. The second column contains the data for the strLastName variable.

Write a Structure statement that defines a structure named Order. The structure contains four member variables named strItemNum , strItemDesc , decPrice , and intQuantity . Then write the Dim statement that declares an Order variable named furniture .

Programmers use structure variables to store related items in an array, even when the items have different data types.

After opening a file for input, you can use the ____ to read the file's contents, one line at a time.

You can use the Strings.Space method to include a specific number of space characters in a string.

When you pass a structure variable to a Sub or Function procedure, its member variables are not automatically passed.

Case-Based Critical Thinking Questions Case 1 - Frames Unlimited Frames Unlimited is a wholesale picture and poster frame business. Frame data is stored in sequential access files that contain four columns: item number, item name, size, and price. You should ____ the pictureFrame.txt file as soon as you have finished using it.

After declaring a StreamReader variable, you can use the ____ to open a sequential access file for input; doing this automatically creates a StreamReader object.

Write the statement that would remove the item "RGT12985" from the lstPartNumber control.

In the syntax for the PadLeft method, ____ is an integer that represents the total number of characters you want the string to contain.

Case-Based Critical Thinking Questions Case 1 - Frames Unlimited Frames Unlimited is a wholesale picture and poster frame business. Frame data is stored in sequential access files that contain four columns: item number, item name, size, and price. Which of the following statements removes the selected line in the list box?

You can use the ____ to open a sequential access file for output.

Write an If clause that determines whether the sequential access file named contacts.txt exists. If the file exists, open the file. If the file does not exist, display the message "File not found" in a message box. The application is named "View Contacts".

You reserve memory locations by declaring a structure variable.

Problems - Correcting Logic and Code Errors The following sample of code contains errors. Rewrite the incorrect statements to correct all errors. Structure ExamGrades Public decExam1 As Decimal Public decExam2 As Decimal Public decExam3 As Decimal End Structure --------------------------- Private Function CalcAverage(ByVal grades As Decimal) As Decimal ' calculates and returns the average grade Dim decSum As Decimal decSum = grades.Exam1 + grades.Exam2 + grades.Exam3 Return decSum * 3 End Function --------------------------- Private Sub btnAverage_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnAverage.Click ' display the average exam grade Dim threeGrades As ExamGrades Dim decAverage As Decimal Decimal.TryParse(txtGrade1.Text, decExam1) Decimal.TryParse(txtGrade2.Text, decExam2) Decimal.TryParse(txtGrade3.Text, decExam3) decAverage = CalcAverage(threeGrades) lblResult.Text = decAverage.ToString("N1") End Sub