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Command1.Caption = "Calculate" Command1.FontSize = 10 Command2.Caption = "Exit" Command2.FontSize = 10 End Sub Private Sub mnuNew_Click() Dim NewFile As String, Day As String Dim HiTemp As Single CommonDialog1.CancelError = True On Error GoTo CancelButton CommonDialog1.Filter = "Text file (*.txt) |*.txt" CommonDialog1.ShowSave NewFile = CommonDialog1.FileName Open NewFile For Output As #1 Day = InputBox("Please enter the day of the week _ (type END when finished):", "Day") Do While UCase(Day) <> "END" HiTemp = Val(InputBox("Please enter the high temperature:", "High Temp")) Write #1, Day, HiTemp Day = InputBox("Please enter the day of the week _ (type END when finished):", "Day") Loop Close #1 CancelButton: Exit Sub End Sub Private Sub mnuAppend_Click() Dim OldFile As String, Day As String Dim HiTemp As Single CommonDialog1.CancelError = True On Error GoTo CancelButton CommonDialog1.Filter = "Text file (*.txt) |*.txt" CommonDialog1.ShowOpen OldFile = CommonDialog1.FileName Open OldFile For Append As #1 Day = InputBox("Please enter the day of the week _ (type END when finished):", "Day") Do While UCase(Day) <> "END" HiTemp = Val(InputBox("Please enter the high temperature:", "High Temp")) Write #1, Day, HiTemp Day = InputBox("Please enter the day of the week _ (type END when finished):", "Day") Loop Close #1 CancelButton: Exit Sub End Sub
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Private Sub mnuExit_Click() End End Sub Private Dim Dim Dim Sub Command1_Click() OldFile As String, Day As String i As Integer, n As Integer HiTemp As Single, Sum As Single, Average As Single
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CommonDialog1.CancelError = True On Error GoTo CancelButton CommonDialog1.Filter = "Text file (*.txt) |*.txt" CommonDialog1.ShowOpen OldFile = CommonDialog1.FileName Open OldFile For Input As #1 i = 0 'loop counter Sum = 0 Do Until EOF(1) Input #1, Day, HiTemp Sum = Sum + HiTemp i = i + 1 n = i 'number of items read from data file Loop Average = Sum / n Text1.Text = Format(Average, "##.#") Close #1 CancelButton: Exit Sub End Sub Private Sub Command2_Click() End End Sub
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Event procedure Command1_Click causes the data file to be read and the average to be calculated. The data file is opened as an input file, after its file name has been selected via the Open common dialog box, as illustrated in Fig. 9.26. The Do Until loop then reads information sequentially from each line within the data file. Note that the day of the week and the corresponding high temperature must both be read from each line, though only the temperature is used in the calculations. As the loop progresses, the integer variable n records the number of daily temperatures that have been read. This variable will represent the total number of data values once the loop has been completed. Note that the final value of n is used at the completion of the loop, in order to calculate the average. Once the average daily temperature has been calculated, its formatted value (one decimal place) is displayed within the text box, and the data file is closed. Fig. 9.27 shows the final result, based upon the 14 temperatures recorded within the version of the data file Daily Temperatures.txt presented in Example 9.5. We see that the average daily high temperature is 78.7 F.
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Many applications require that the information in a data file be upgraded by modifying the information in the data file or by adding new information. The general procedure for updating a sequential data file is to copy the contents of the old data file to a new data file, incorporating any additions or changes to the data during the copy procedure. After the updating has been completed, the old data file can be deleted and the new (updated) data file renamed as the old data file. The procedure is illustrated below in Example 9.7.
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