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Exam 10: Structures and Sequential Access Files

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Question 21

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A file to which information is written is referred to as a(n) ____ file.

A) report
B) text
C) output
D) data

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Question 22

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Write the code to declare a variable named outFile that can be used to write data to a sequential access file. Then write the statement to open a sequential access file named samples.txt for output. New data should be written to the file after any existing data in the file.

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Dim outFile As IO.St...

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Question 23

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Describe two advantages to programmers of using structures and structure variables.

Which of the following can be used to determine whether the accounts.txt file exists?

To access a member of a structure variable in an array, you use the syntax ____.

Programmers refer to a sequence of characters as a ____.

Data types created using the Structure statement are referred to as user-defined data types or structures.

Most programmers use the Structure statement, rather than the Class statement, to create data types that contain procedures.

The Peek method, looks ahead into the file to determine whether the file contains another character to read.

A(n) ____ is defined as a sequence (stream) of characters followed by the newline character.

The syntax used to declare a StreamWriter variable is ____.

Which of the following statements can be used to fill a string variable with asterisks resulting in "*****$675.89"?

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

Problems - Correcting Logic and Code Errors The following sample of code contains errors. Rewrite the incorrect statements to correct all errors. Private Sub btnDisplay_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDisplay.Click ' display the contents of the students.txt file ' declare variables Dim inFile As IO.StreamWriter Dim strStudent As String ' clear previous students from the Students box lblStudents.Text = String.Empty ' determine whether the file exists If IO.Exists("students.txt") = True Then ' open the file for input inFile = IO.File.ReadText("students.txt") ' process loop instructions until end of file Do Until inFile.Peek -1 ' read a student line strStudent = inFile.ReadLine ' display the student lblStudents.Text = lblStudents.Text & strStudent & ControlChars.NewLine Loop ' close the file Me.Close() Else MessageBox.Show("File not found","Students", MessageBoxButtons.OK, MessageBoxIcon.Information) End If End Sub

Write a Do clause that reads each line of text in a sequential access file and assigns the line to the strTextLine variable. Process the loop until the end of the file has been reached. The file is associated with a StreamReader variable named inFile .

Which of the following statements will write the text "Programming" to a sequential access file?

Write the code to declare a variable named inFile that can be used to read data from a sequential access file. Then write the statement to open a sequential access file named samples.txt for input.

Which of the following opens the employee.txt file for output, creates a StreamWriter object, and assigns it to the outFile variable?

Variables declared using a structure are often referred to as ____.

The members of a structure can be variables, constants, or ____.