Computer Programming Concepts and Visual Basic David I. Schneider

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230 Computer Programming Concepts and Visual Basic FIGURE 7-5 Template for Entering a Deposit May 5, 1999 Name: David Schneider Starting balance: $1,000.00 Date Transaction Amount Balance Apr 21, 1999 Check #: 1 $75.95 Paid to: Land’s End Memo: shirts $924.05 Apr 29,1999 Check #: 2 $125.00 Paid to: Bethesda Coop Memo: groceries $799.05 May 5,1999 Deposit #: 1 $245.00 Source: Prentice Hall Memo: typing expenses Ending Balance: $1,044.05 $1,044.05 FIGURE 7-6 Sample Printout of Transactions The common design for the check and deposit slip allows one set of controls to be used for both items. Figure 7-7 shows the controls and their suggestive names. The caption of the label lblToFrom will change back and forth between Pay To and Source. FIGURE 7-7 Control Names for Checkbook Management Program. Table 7.1 lists the objects and their initial properties. Because the program will always begin by displaying the next check, the various captions and the BackColor property of the picture box could have been set at design time. We chose instead to leave these assignments
to the SetupCheck Sub procedure, which is normally used to switch from deposit entry to check entry, but also can be called by the Form_Load event procedure to prepare the initial mode (check or deposit) for the form. TABLE 7.1 Objects and Initial Properties for the Checkbook Management Program Object Property Setting frmCheckbook picBox lblName BackStyle 0 – Transparent txtNum BorderStyle 0 – None lblDate BackStyle 0 – Transparent Caption Date txtDate lblToFrom BackStyle 0 – Transparent txtToFrom lblAmount BackStyle 0 – Transparent Caption Amount $ txtAmount lblMemo BackStyle 0 – Transparent Caption Memo txtMemo lblCurBal Caption Current Balance lblBalance cmdRecord cmdMode cmdPrint Caption &Print Report cmdQuit Caption &Quit The transactions are stored in a data file named CHKBOOK.TXT. The first four entries of the file are the name to appear on the check or deposit slip, the starting balance, the number of the first check, and the number of the first deposit slip. After that, each transaction is recorded as a sequence of eight items—the type of transaction, the contents of txtToFrom, the current balance, the number of the last check, the number of the last deposit slip, the amount of money, the memo, and the date. ■ CODING THE PROGRAM A Case Study: Recording Checks and Deposits 231 The top row of Figure 7-8 shows the different events to which the program must respond. Table 7.2 identifies the corresponding event procedures and the general procedures they call. FIGURE 7-8 Hierarchy Chart for Checkbook Management Program
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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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Page 188 and 189: 180 Computer Programming Concepts a
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10.1 LIST BOXES AND COMBO BOXES The
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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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Computer Programming Concepts and Visual Basic David I. Schneider

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