Computer Programming Concepts and Visual Basic David I. Schneider

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204 Computer Programming Concepts and Visual Basic had the focus, then the GotFocus event procedure would be invoked again as a result of the SetFocus, and then again as a result of the SetFocus performed by this invocation of GotFocus, and so on, resulting in an infinite loop. 3. txtCell_LostFocus invokes the general procedure DisplayTotals when the cursor leaves one of the spreadsheet cells. DisplayTotals in turn invokes five general procedures that each compute one set of needed totals and display the results by assigning values to appropriate text boxes. TotalIncome adds up the income for each quarter and saves the results in the array iTot( ). Similarly, TotalExpenses adds up the expenses for each quarter and saves the results in the array eTot( ). ComputeBalances takes the results stored in iTot( ) and eTot( ) and subtracts them to determine the balance for each quarter. TotalRows adds the four quarters for each category and assigns the results to the text boxes at the right end of each row. Finally, DetermineGrandTotals adds the values in iTot( ) and eTot( ) to determine the values for the right end of the “balance” row and each “total” row. 4. cmdNew_Click prepares for the entry of a new spreadsheet by setting the Text property of each element of the control array txtCell( ) to the null string and then setting focus to the first cell in the spreadsheet. 5. cmdQuit_Click ends the program. FIGURE 6.12 Hierarchy Chart for Spreadsheet Program TABLE 6.8 Tasks and Their Procedures 1. Create & Initialize spreadsheet Form_Load 1.1 Create & position cells & labels CreateSpreadsheet 1.2 Display fixed headings SetStructure 1.3 Display default categories SetDefaults 2. Prevent editing of wrong cells txtCell_GotFocus 3. Update totals when cursor leaves a cell txtCell_LostFocus (Display Totals) 3.1 Total income each quarter TotalIncome 3.2 Total expenses each quarter TotalExpenses 3.3 Compute balances each quarter ShowBalances 3.4 Total each income & expense category TotalRows 3.5 Determine grand totals ShowGrandTotals 4. Start a new spreadsheet cmdNew_Click 5. End program cmdQuit_Click
Dim maxCol As Integer ‘Number of columns in spreadsheet Dim maxRow As Integer ‘Number of rows in spreadsheet Dim incStartRow As Integer ‘Row where income categories begin Dim incStopRow As Integer ‘Row where income categories end Dim incTotRow As Integer ‘Row where income total is displayed Dim expStartRow As Integer ‘Row where expense categories begin Dim expStopRow As Integer ‘Row where expense categories end Dim expTotRow As Integer ‘Row where expense total is displayed Dim balRow As Integer ‘Row where balance is displayed Dim startCol As Integer ‘Column where numeric data begins Dim stopCol As Integer ‘Column where numeric data ends Dim totCol As Integer played ‘Column where total for each row is dis- ’Control Arrays’txtCell() Control array for data cells ’lblRowLab() Control array for numeric row labels ’lblColLab() Control array for alphabetic column labels Private Sub cmdNew_Click() Dim row As Integer, col As Integer ‘Clear all data and total text boxes For col = 1 To maxCol For row = 1 To maxRow txtCell(Indx(row, col)).Text = “” Next row Next col Call SetStructure ‘Place cursor in first data txtCell txtCell(Indx(1, 1)).SetFocus End Sub Private Sub cmdQuit_Click() End End Sub A Case Study: Calculating with a Spreadsheet 205 Private Sub CreateSpreadsheet() Dim row As Integer, col As Integer, i As Integer Dim cellHeight As Single, cellWidth As Single Dim cellTop As Single, cellLeft As Single cellHeight = txtCell(1).Height cellWidth = txtCell(1).Width ‘Create cells For row = 1 To maxRow For col = 1 To maxCol i = Indx(row, col) If Not (col = 1 And row = 1) Then Load txtCell(i) End If If row > 1 Then cellTop = txtCell(Indx(row - 1, col)).Top txtCell(i).Top = cellTop + cellHeight End If If col > 1 Then cellLeft = txtCell(Indx(row, col - 1)).Left txtCell(i).Left = cellLeft + cellWidth End If txtCell(i).Visible = True Next col
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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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