Computer Programming Concepts and Visual Basic David I. Schneider

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306 Computer Programming Concepts and Visual Basic EXAMPLE 2 The following program creates a simplified spreadsheet. The user places a number into the active cell by typing the number into an input box. The program keeps a running total of the sum of the numbers. ‘In (Declarations) section of (General) Dim numRows As Integer ‘number of rows Dim numCols As Integer ‘number of columns Object Property Setting frmSprdSht Caption Spreadsheet lblAdjust Caption Adjust cmdRows Caption Rows cmdCols Caption Columns cmdQuit Caption Quit lblMsg Caption Click on a cell to change its value msgSprdSht ScrollBars 0 – flexScrollBarNone FixedRows 0 FixedCols 0 Font Courier New Private Sub cmdRows_Click() Dim temp As String ‘Adjust the number of rows in the spreadsheet temp = InputBox(“Enter new number of rows (4-24):”) If (Val(temp) >= 4) And (Val(temp) < Then numRows = Val(temp) Call SetUpGrid Call ShowValues Call ShowTotals End If End Sub Private Sub cmdCols_Click() Dim temp As String ‘Adjust number of columns in the spreadsheet temp = InputBox(“Enter new number of columns (2-7):”) If (Val(temp) >= 2) And (Val(temp)
Private Sub cmdQuit_Click() End End Sub Private Sub Form_Load() ‘Set default number of rows and columns numRows = 8 ‘row 0 is for headings, last 2 rows are for totals numCols = 2 ‘column 0 is for category names Call SetUpGrid Call ShowValues Call ShowTotals End Sub Private Sub msgSprdSht_Click() Dim temp As String, message As String ’Obtain new value for cell if it is not in the “total” row If messageSprdSht.Row < numRows - 2 Then message = “Enter new value for the row ” message = message & Str(msgSprdSht.Row + 1) & “ column ” message = message & Str(msgSprdSht.Col + 1) & “ cell:” temp = InputBox(message,,msgSprdSht.Text) ‘Propose old value as default If msgSprdSht.Col = 0 Then msgSprdSht.Text = temp ElseIf msgSprdsht.Row = 0 Then msgSprdSht.Text = temp Else msgSprdsht.Text = FormatNumber(Val(temp)vbFalse) Call ShowTotals End If End If End Sub Private Sub SetUpGrid() Dim colNum As Integer ‘Set up grid msgSprdSht.Col = 0 msgSprdSht.Row = msgSprdSht.Rows - 1 msgSprdSht.Text = “” ‘erase “Total” in case increasing rows msgSprdSht.Rows = numRows msgSprdSht.Cols = numCols ‘Set column widths; right-justify columns with numeric data msgSprdSht.ColWidth(0) = 2000 ‘space for category names msgSprdSht.ColAlignment(0) = 1 ‘show data left-justified For colNum = 1 To numCols - 1 msgSprdSht.ColWidth(colNum) = 1200 ‘space for dollar amounts msgSprdSht.ColAlignment(colNum) = 7 ‘show data right-justified Next colNum ‘Set overall grid size to minimum needed for the data msgSprdSht.Width = 2000 + (numCols - 1) * 1200 + 15 * (numCols + 1) + 8 msgSprdSht.Height = numRows*msgSprdSht.RowHeight(0)+15*(numRows + 1)+8 ‘Adjust form to accommodate grid and other controls frmSprdSht.Width = msgSprdSht.Left + msgSprdSht.Width + 200 frmSprdSht.Height = msgSprdSht.Top + msgSprdSht.Height + 500 frmSprdSht.Top = 0 frmSprdSht.Left = 0 End Sub Five Additional Objects 307
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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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S E C T I O N 7 SEQUENTIAL FILES
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S E C T I O N 8 RANDOM-ACCESS FILES
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Page 265: S E C T I O N 9 THE GRAPHICAL DISPL
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Page 295 and 296: 10.1 LIST BOXES AND COMBO BOXES The
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Page 309 and 310: THE SHAPE CONTROL The shape control
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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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