Computer Programming Concepts and Visual Basic David I. Schneider

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108 Computer Programming Concepts and Visual Basic costs = Val(txtCosts.Text) revenue = Val(txtRev.Text) picResult.Cls If costs = revenue Then picResult.Print “Break even” Else If costs < revenue Then profit = revenue - costs picResult.Print “Profit is “; FormatCurrency(profit) Else loss = costs - revenue picResult.Print “Loss is “; FormatCurrency(loss) End If End If End Sub [Run, type 9500 and 8000 into the text boxes, and press the command button.] EXAMPLE 3 The If block in the following program has a logical operator in its condition Object Property Setting frmQuiz Caption A Quiz lblQuestion Caption How many gallons does a ten-gallon hat hold? txtAnswer Text (blank) cmdEvaluate Caption Evaluate Answer picSolution Private Sub cmdEvaluate_Click() Dim answer As Single ‘Evaluate answer picSolution.Cls answer = Val(txtAnswer.Text) If (answer >= .5) And (answer
The Else part of an If block can be omitted. This important type of If block appears in the next example. EXAMPLE 4 The following program offers assistance to the user before presenting a quotation. Object Property Setting frm5_2_4 Caption Quotation lblQuestion Caption Do you know what the game of skittles is (Y/N)? txtAnswer Text (blank) cmdDisplay Caption Display Quotation picQuote Private Sub cmdDisplay_Click() Dim message As String message = “Skittles is an old form of bowling in which a wooden” & _ “ disk is used to knock down nine pins arranged in a square.” If UCase(txtAnswer.Text) = “N” Then MsgBox message, , “” End If picQuote.Cls picQuote.Print “Life ain’t all beer and skittles. - Du Maurier (1894)” End Sub [Run, type N into the text box, and press the command button.] [Press OK.] Note: Rerun the program, type Y into the text box, press the command button, and observe that the description of the game is bypassed. An extension of the If block allows for more than two possible alternatives with the inclusion of ElseIf clauses. A typical block of this type is If condition1 Then action1 ElseIf condition2 Then action2 ElseIf condition3 Then action3 Else action4 End If If Blocks 109
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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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Page 81 and 82: 3.1 SUB PROCEDURES, PART I Structur
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Page 91 and 92: Call CalculateSum(x, y, s) Call Dis
Page 93 and 94: ■ FORM-LEVEL VARIABLES Visual Bas
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Page 119 and 120: picTax.Cls picTax.Print “Your FIC
Page 121 and 122: Case 4, 5 picOutcome.Print “You a
Page 123 and 124: EXAMPLE 3 The following program use
Page 125 and 126: Case Else picResult.Print “The st
Page 127 and 128: 4. The items in the value list must
Page 129 and 130: The hierarchy chart in Figure 4-4 s
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Page 133 and 134: Private Function TaxMarried(adjPay
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Page 137: S E C T I O N 5 REPETITION
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S E C T I O N 6 ARRAYS
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162 Computer Programming Concepts a
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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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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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