Computer Programming Concepts and Visual Basic David I. Schneider

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206 Computer Programming Concepts and Visual Basic Next row ‘Create Row Labels For row = 2 To maxRow Load lblRowLab(row) lblRowLab(row).Top = lblRowLab(row - 1).Top + cellHeight lblRowLab(row).Caption = LTrim(Str(row)) lblRowLab(row).Visible = True Next row ‘Create Column Labels For col = 2 To maxCol Load lblColLab(col) lblColLab(col).Left = lblColLab(col - 1).Left + cellWidth lblColLab(col).Caption = Chr(col + 64) lblColLab(col).Visible = True Next col ‘Set form height and width to accommodate all objects i = Indx(maxRow, maxCol) frmSpreadsheet.Height = txtCell(i).Top + cellHeight + 500 frmSpreadsheet.Width = txtCell(i).Left + cellWidth + 200 End Sub Private Sub DisplayTotals() ReDim itot(startCol To stopCal) As Single ReDim etot(startCol To stopCal) As Single ‘Calculate and show totals for Income each quarter Call TotalIncome(itot()) ‘Calculate and show totals for Expenses each quarter Call TotalExpenses(etot()) ‘Calculate and show Balances for each quarter Call ShowBalances(itot(), etot()) ‘Calculate and show the Total of each Income & Expense category Call TotalRows ‘Calculate and show grand totals of quarter totals and balances Call ShowGrandTotals(itot(), etot()) End Sub Private Sub Form_Load() ‘Establish number of rows and columns. Trial and error show ‘that a maximum of 20 rows and 8 columns will fit the screen. ‘For this particular application, 16 rows and 6 columns are adequate. maxRow = 16 maxCol = 6 Call CreateSpreadsheet Call SetStructure Call SetDefaults End Sub Private Function Indx(row As Integer, col As Integer) As Integer Indx = (row - 1) * maxCol + col End Function Private Sub SetDefaults() ‘Set default values specific to this application txtCell(Indx(3, 1)).Text = “Job” txtCell(Indx(4, 1)).Text = “Parents” txtCell(Indx(5, 1)).Text = “Scholarship” txtCell(Indx(9, 1)).Text = “Tuition”
txtCell(Indx(10, 1)).Text = “Food” txtCell(Indx(11, 1)).Text = “Rent” txtCell(Indx(12, 1)).Text = “Books” txtCell(Indx(13, 1)).Text = “Misc” End Sub Private Sub SetStructure() txtCell(Indx(1, 2)).Text = “Fall” txtCell(Indx(1, 3)).Text = “Winter” txtCell(Indx(1, 4)).Text = “Spring” txtCell(Indx(1, 5)).Text = “Summer” txtCell(Indx(1, 6)).Text = “Total” txtCell(Indx(1, 6)).ForeColor = vbGreen txtCell(Indx(2, 1)).Text = “Income” txtCell(Indx(2, 1)).ForeColor = vbMagenta txtCell(Indx(6, 1)).Text = “Total” txtCell(Indx(6, 1)).ForeColor = vbGreen txtCell(Indx(8, 1)).Text = “Expenses” txtCell(Indx(8, 1)).ForeColor = vbMagenta txtCell(Indx(14, 1)).Text = “Total” txtCell(Indx(14, 1)).ForeColor = vbGreen txtCell(Indx(16, 1)).Text = “Balance” txtCell(Indx(16, 1)).ForeColor = vbGreen incStartRow = 3 incStopRow = 5 incTotRow = 6 expStartRow = 9 expStopRow = 13 expTotRow = 14 balRow = 16 startCol = 2 stopCol = 5 totCol = 6 End Sub A Case Study: Calculating with a Spreadsheet 207 Private Sub ShowBalances(itot() As Single, etot() As Single) Dim col As Integer For col = startCol To stopCol txtCell(Indx(balRow, col)).Text = FormatNumber(itot(col) - etot(col), 0) Next col End Sub Private Sub ShowGrandTotals(itot() As Single, etot() As Single) Dim col As Integer, iTotal As Single, eTotal As Single ‘Compute and display grand totals for income, expenses, and balance iTotal = 0 eTotal = 0 For col = startCol To stopCol iTotal = iTotal + itot(col) eTotal = eTotal + etot(col) Next col txtCell(Indx(incTotRow, totCol)) = FormatNumber(iTotal, 0) txtCell(Indx(expTotRow, totCol)) = FormatNumber(eTotal, 0) txtCell(Indx(balRow, totCol)) = FormatNumber(iTotal - eTotal, 0) End Sub
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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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Page 167: S E C T I O N 6 ARRAYS
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S E C T I O N 9 THE GRAPHICAL DISPL
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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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