Computer Programming Concepts and Visual Basic David I. Schneider

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238 Computer Programming Concepts and Visual Basic TABLE 7.5 Final 1998 American League East Standings American League East W L Pct New York 114 48 .704 Boston 92 70 .568 Toronto 88 74 .543 Baltimore 79 83 .488 Tampa Bay 63 99 .389 3. Write a rudimentary word processing program. The program should do the following: (a) Use InputBox to request the name of the sequential file to hold the document being created. (b) Set the label for a text box to “Enter Line 1” and allow the user to enter the first line of the document into a text box. (c) When the Enter key is pressed or a “Record Line” command button is clicked, determine if the line is acceptable. Blank lines are acceptable input, but lines exceeding 60 characters in length should not be accepted. Advise the user of the problem with a message box, and then set the focus back to the text box so that the user can edit the line to an acceptable length. (d) When an acceptable line is entered, write this line to the file and display it in a picture box. (e) Change the prompt to “Enter Line 2”, clear the text box, allow the user to enter the second line of the document into the text box, and carry out (c) for this line using the same picture box. (Determine in advance how many lines the picture box can display and only clear the picture box when the lines already displayed do not leave room for a new line.) (f) Continue as in (d) with appropriate labels for subsequent lines until the user clicks on a “Finished” command button. (g) Clear the picture box and display the number of lines written and the name of the data file created. 4. Write a program that counts the number of times a word occurs in the sequential file created in Programming Project 3. The file name and word should be read from text boxes. The search should not be sensitive to the case of the letters. For instance, opening a file that contained the first three sentences of the directions to this problem and searching for “the” would produce the output: “the” occurs six times. 5. Create and Maintain Telephone Directories. Write a program to create and maintain telephone directories. Each directory will be a separate sequential file. The following command buttons should be available: (a) Select a directory to access. A list of directories that have been created should be stored in a separate sequential file. When a request is made to open a directory, the list of available directories should be displayed as part of an InputBox prompt requesting the name of the directory to be accessed. If the user responds with a directory name not listed, the desire to create a new directory should be confirmed, and then the new directory created and added to the list of existing directories. (b) Add name and phone number (as given in the text boxes) to the end of the current directory. (c) Delete name (as given in the text box) from the current directory. (d) Sort the current directory into name order.
(e) Print out the names and phone numbers contained in the current directory. (f) Terminate the program. 6. Table 7.6 contains the statistics for a stock portfolio. (The current prices are given for October 1, 1998.) TABLE 7.6 Stock Portfolio Number Date Purchase Current Stock of Shares Purchased Price/Share Price/Share Amgen 200 8/19/97 50.750 75.625 Delta Airlines 100 12/3/97 111.750 97.250 Novell 500 8/27/97 10.375 12.250 PPG 100 12/18/97 56.750 54.500 Timken 300 3/13/98 34.625 15.125 (a) Compose a program to create the sequential file STOCKS.TXT containing the information in Table 7.6. (b) Compose a program to perform the following tasks. A possible form design is shown in Figure 7-9. (1) Display the information in the file STOCKS.TXT as in Table 7.6 when the user clicks on a “Display Stocks” command button. (2) Add an additional stock onto the end of the file STOCKS.TXT when the user clicks on an “Add Stock” command button. The data for the new stock should be read from appropriately labeled text boxes. (3) Update the Current Price/Share of a stock in the file STOCKS.TXT when the user clicks on an “Update Price” command button. The name of the stock to be updated and the new price should be read from the appropriate text boxes. The file STOCKS.TXT should then be copied to a temp file until the specified stock is found. The update record for this stock should then be written to the temp file, followed by all remaining records in STOCKS.TXT. Finally, the original STOCKS.TXT file should be erased and the temp file renamed to STOCKS.TXT. (4) Process the data in the file STOCKS.TXT and produce the display shown in Figure 7-10 when a “Show Profit/Loss” command button is clicked. (5) Quit. FIGURE 7-9 Possible Form Design for Programming Project 6 Programming Projects 239
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Computer Programming Concepts and V
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CONTENTS SECTION 1: PROBLEM SOLVING
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13.3 WEB PAGE PROGRAMMING WITH VBSC
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S E C T I O N 1 PROBLEM SOLVING
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4 Computer Programming Concepts and
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10 Computer Programming Concepts an
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S E C T I O N 2 FUNDAMENTALS OF PRO
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3.1 SUB PROCEDURES, PART I Structur
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The second task performed by the ad
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‘The density (number of people pe
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"Hawaii", 1184000, 6471 "Alaska", 6
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dure by just using the variable in
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Call CalculateSum(x, y, s) Call Dis
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■ FORM-LEVEL VARIABLES Visual Bas
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3. In Appendix D, the section “St
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Private Sub cmdDetermine_Click() Di
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Private Sub cmdCompute_Click() Dim
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preceded with the word ByVal. Built
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It is clear from the hierarchy char
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The meaningful procedure names, alo
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FIGURE 3-9 Sample Run for Programmi
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4.1 RELATIONAL AND LOGICAL OPERATOR
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(a) (2 < n) And (n < 6) (b) (2 < n)
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SOLUTION: In the following program,
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The Else part of an If block can be
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picTax.Cls picTax.Print “Your FIC
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Case 4, 5 picOutcome.Print “You a
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EXAMPLE 3 The following program use
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Case Else picResult.Print “The st
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4. The items in the value list must
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The hierarchy chart in Figure 4-4 s
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‘Program to compute employees’
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Private Function TaxMarried(adjPay
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and tells us whether the food meets
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S E C T I O N 5 REPETITION
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132 Computer Programming Concepts a
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S E C T I O N 6 ARRAYS
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Private Sub cmdAdd_Click() Dim item
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either typing in information or jus
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Private Sub cmdDisplay_Click() picF
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clicks on the square to toggle betw
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circle and the button is said to be
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hsbBar.Value changes accordingly. T
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THE SHAPE CONTROL The shape control
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FIGURE 10-9 A Picture Created with
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Rows 9 ScrollBars 0 - flexScrollBar
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Private Sub cmdQuit_Click() End End
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Here, the menu bar contains two men
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Clipboard.Clear deletes the content
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cedures that are available to all f
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The Flags property influences certa
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13. Additional forms serve as new w
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6. Voting Machine. The members of t
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11.1 AN INTRODUCTION TO DATABASES T
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9. Click on the down arrow to the r
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clicked or a Move, Update, Delete,
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Do While (Not foundFlag) And (Not d
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mary key. Databases of student enro
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question mark stands for a single c
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1995 populations. When the second c
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If a Find method does not locate a
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place an x in the check box next to
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population (in descending order). W
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Creating and Designing Databases 34
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9. When all fields have been specif
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Creating and Designing Databases 34
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TABLE 11.5(B) TABLE 11.5(C) course
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(a) Update the quantity field of th
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12.1 CLASSES AND OBJECTS noun A wor
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Task Statement Assign a value to a
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EXAMPLE 1 and then an instance of t
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[Run, enter the data for a student
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SOLUTION: Object Property Setting f
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4. Methods can be either Function o
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‘Student Class (CStudent) Private
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txtFinal.Text = “” picGrades.Pr
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■ EVENTS In the previous section
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frmCircles.ForeColor = vbRed ‘Mak
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Public Function X() As Integer X =
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End Sub Private Sub cmdDropBomb_Cli
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Next i End Sub Public Function Read
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Remove method. The number of object
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S E C T I O N 13 COMMUNICATING WITH
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A P P E N D I C E S
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APPENDIX C VISUAL BASIC STATEMENTS,
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CANCEL The Cancel property provides
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COLS and ROWS The Cols and Rows pro
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DEFINT, DEFLNG, DEFSNG, DEFDBL, DEF
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ENVIRON Visual Basic has an environ
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FONT.ITALIC or FONTITALIC These pro
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yields “1234.”, Format(1234000,
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the length of the string currently
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ISNUMERIC The value of the function
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Unlock statement is used to remove
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Focus Default Default Number First
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OR (Logical Operator) The logical e
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the same as in the original Dimensi
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SECOND The function Second extracts
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STRETCH When the Stretch property o
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UNLOCK The Unlock command is intend
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[COLOR]: Numbers written in base 16
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Appendix D 457
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466 Technology of the Internet D Da
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468 Technology of the Internet Rela
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470 Technology of the Internet 2. D
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SYSTEM REQUIREMENTS CD-ROM INSTRUCT
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