Computer Programming Concepts and Visual Basic David I. Schneider

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114 Computer Programming Concepts and Visual Basic where Case Else (and its action) is optional, and each value list contains one or more of the following types of items separated by commas: 1. A constant 2. A variable 3. An expression 4. An inequality sign preceded by Is and followed by a constant, variable, or expression 5. A range expressed in the form a To b, where a and b are constants, variables, or expressions Different items appearing in the same list must be separated by commas. Each action consists of one or more statements. After the selector is evaluated, Visual Basic looks for the first value-list item containing the value of the selector and carries out its associated action. Figure 4-3 contains the flowchart for a Select Case block. The pseudocode for a Select Case block is the same as for the equivalent If block. FIGURE 4-3 Flowchart for a Select Case Block
EXAMPLE 3 The following program uses several different types of value lists. With the response shown, the first action was selected because the value of y – x is 1. Object Property Setting Private Sub cmdInterpret_Click() Dim x As Integer, y As Integer, num As Integer ‘One, Two, Buckle My Shoe picPhrase.Cls x = 2 y = 3 num = Val(txtNumber.Text) Select Case num Case y - x, x picPhrase.Print “Buckle my shoe.” Case Is
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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 89 and 90: dure by just using the variable in
Page 91 and 92: Call CalculateSum(x, y, s) Call Dis
Page 93 and 94: ■ FORM-LEVEL VARIABLES Visual Bas
Page 95 and 96: 3. In Appendix D, the section “St
Page 97 and 98: Private Sub cmdDetermine_Click() Di
Page 99 and 100: Private Sub cmdCompute_Click() Dim
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Page 113 and 114: (a) (2 < n) And (n < 6) (b) (2 < n)
Page 115 and 116: SOLUTION: In the following program,
Page 117 and 118: The Else part of an If block can be
Page 119 and 120: picTax.Cls picTax.Print “Your FIC
Page 121: Case 4, 5 picOutcome.Print “You a
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
Page 131 and 132: ‘Program to compute employees’
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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Page 167: S E C T I O N 6 ARRAYS
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164 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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