[Solved] CNIT155 Assignment-11

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File Name: CNIT155_Assignment-11.zip
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Objectives:

  • Checkbox control
  • Saving to the text file
  • Reading from a text file
  • Form Closing Event Method
  • Form_Load event method

Problem Description: Design a C# project to store up to 100 students information in parallel arrays. The user will enter each students name, score in provided Textboxes and check the Checkbox if student is a CIT major, followed by a click on the Enter button to store the student in the parallel arrays.

Figure 1 Screen capture when Display is clicked

Class Scope Declarations:

  • Declare a named constant to store size of the parallel arrays = 100.
  • Declare 3 parallel arrays to store up to 100 students names, scores and CIT major (true / false). Use the named constant at declaration.
  • Declare a counter to keep track of the next available index in the array.
  • Declare a variable to store the file name with the full path:

Private String mFileName = Path.Combine (Application.StartupPath , Students.txt);

Enter Button (pseudo-code)

  • Validate the users input Call the helper method.
  • If data is not valid return.
  • Store the entered data in parallel arrays.
    • If the check box is checked, store true in the array, otherwise store false.
  • If array is full
    • Inform the user
    • Disable the Enter button.
  • Call the helper method to clear the input.

Display Button:

  • Inform the user if array is empty, and return.
  • Display all the names, scores and CIT major (true / false) in the Listbox.

Stats Button:

  • Inform the user if array is empty, and return.
  • Clear the Listbox
  • Display number of students entered.
  • Display number of CIT students entered.
  • Compute the average. Display it with proper format.

Clear Button:

  • Call ClearInput() to clear the entered input.
  • Clear the Listbox.

Exit Button: End program execution.

FormClosing Event:

Save data stored in parallel arrays to a text file named students.txt, one student per line, with tab delimited fields. Refer to Figure-3.

  • Declare an object variable of type StreamWriter.
  • Open the file txt at the same location as your projects .exe
  • Write a loop to write each students data on a separate line, tab delimited.
  • Close the file.

Helper Methods:

  • ValidateInput():
    1. Input: none
    2. Output data type: bool
    3. Task: Validate users input based on the following rules:

Existence check on name.

Score must be a whole number.

Valid range for score is 0 to 100, both inclusive.

  • ClearInput ( )
    1. Input: none
    2. Output: void
    3. Task: Clear the entered data and set the focus to the top textbox.

Call this method at the end of the Enter button and from the Clear button.

  • DisplayMessage( )
  1. Input: String
  2. Output data type: void
  3. Task: Display the input string using MessageBox.Show(). The Messagebox should include all 4 arguments.

FormClosing Event Method

Save content of the parallel arrays to the text file in this event procedure.

  • Confirm with the user whether to end the program execution or not.
    • Use MessageBox.Show to ask this question. Provide buttons Yes and No in the Messagebox plus the Question icon.
    • If the users answer is NO,
      • Cancel the closing event.
    • Save data stored in parallel arrays to a text file.
      • Declare an object variable of StreamWriter Open the file (use class scope filename) to write to.
      • Write a loop to write each students data to the file in a tab delimited format.
      • Close the file.
    • Include Exception Handling code to handle exceptions (try catch finally).

Figure 22 An image of the text file

Form_Load Event Method

Upload / read data from a text file into the program in parallel arrays in this event method.

  • Check if the file exists (Use the class scope filename).
    • If file does not exist, return.
  • Declare an Object variable of StreamReader class and open the file mFilename for reading.
  • Declare a string variable to store a line read from the file.
  • Write a loop to read until end of the file.
    • Read a line into the string variable.
    • Split the line to extract pieces of data.
    • Store pieces of data in parallel arrays at mIndex.
  • Close the file.
  • Include Exception Handling code to handle exceptions (try catch finally).

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[Solved] CNIT155 Assignment-11
$25