Computer Programming Concepts and Visual Basic David I. Schneider

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208 Computer Programming Concepts and Visual Basic Private Sub TotalExpenses(etot() As Single) Dim row As Integer, col As Integer ‘Total expenses for each of four quarters For col = startCol To stopCol etot(col) = 0 For row = expStartRow To expStopRow etot(col) = etot(col) + Val(txtCell(Indx(row, col)).Text) Next row txtCell(Indx(expTotRow, col)).Text = FormatNumber(etot(col), 0) Next col End Sub Private Sub TotalIncome(itot() As Single) Dim row As Integer, col As Integer ‘Total income for each of four quarters For col = startCol To stopCol itot(col) = 0 For row = incStartRow To incStopRow itot(col) = itot(col) + Val(txtCell(Indx(row, col)).Text) Next row txtCell(Indx(incTotRow, col)).Text = FormatNumber(itot(col), 0) Next col End Sub Private Sub TotalRows() Dim row As Integer, col As Integer, rowTot As Single ‘Total each income category For row = incStartRow To incStopRow rowTot = 0 For col = startCol To stopCol rowTot = rowTot + Val(txtCell(Indx(row, col)).Text) Next col txtCell(Indx(row, totCol)).Text = FormatNumber(rowTot, 0) Next row ‘Total each expense category For row = expStartRow To expStopRow rowTot = 0 For col = startCol To stopCal rowTot = rowTot + Val(txtCell(Indx(row, col)).Text) Next col txtCell(Indx(row, totCol)).Text = FormatNumber(rowTot, 0) Next row End Sub Private Sub txtCell_GotFocus(Index As Integer) Dim row As Integer, col As Integer ‘Force focus into a data txtCell for this application row = Int((Index - 1) / maxCol) + 1 col = ((Index - 1) Mod maxCol) + 1 If col > stopCol Then row = row + 1 col = startCol End If If row < incStartRow Then
ow = incStartRow ElseIf (row > incStopRow) And (row < expStartRow) Then row = expStartRow ElseIf row > expStopRow Then row = incStartRow End If If Indx(row, col) ] Index Then txtCell(Indx(row, col)).SetFocus End If End Sub Private Sub txtCell_LostFocus(Indx As Integer) Call DisplayTotals End Sub SUMMARY 1. For programming purposes, tabular data are most efficiently processed if stored in an array. The ranges of variable arrays are specified by Dim or ReDim statements. 2. An array of labels, text boxes, or command buttons, referred to in general as a control array, can be created by assigning a value (usually zero) to the Index property of the control at design time. Additional elements of the control array are created either at design time by using Ctrl+C and Ctrl+V to copy the first element in the array or at run time by using the Load statement. New elements created in either way inherit all the properties of the first element except the Index, Visible (if created with Load), Top (when copied at design time), and Left (when copied at design time) properties. 3. Two of the best-known methods for ordering (or sorting) arrays are the bubble sort and the Shell sort. 4. Any array can be searched sequentially to find the subscript associated with a sought-after value. Ordered arrays can be searched most efficiently by a binary search. 5. A table can be effectively stored in a two-dimensional array. PROGRAMMING PROJECTS 1. Table 6.9 contains some lengths in terms of feet. Write a program that displays the nine different units of measure, requests the unit to convert from, the unit to convert to, and the quantity to be converted, and then displays the converted quantity. A typical outcome is shown in Figure 6-13. TABLE 6.9 Equivalent Lengths 1 inch = .0833 foot 1 rod = 16.5 feet 1 yard = 3 feet 1 furlong = 660 feet 1 meter = 3.2815 feet 1 kilometer = 3281.5 feet 1 fathom = 6 feet 1 mile = 5280 feet Programming Projects 209
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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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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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