Computer Programming Concepts and Visual Basic David I. Schneider

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124 Computer Programming Concepts and Visual Basic Dim socialSecurity As Single ‘Social Security tax for this week Dim medicare As Single ‘Medicare tax for this week ‘Task 3: Compute social security and medicare tax If totalPay
Private Function TaxMarried(adjPay As Single) As Single ‘Task 6.3: Compute federal tax for married person based on adjusted pay Select Case adjPay Case 0 To 124 TaxMarried = 0 Case 124 To 899 TaxMarried = 0.15 * (adjPay - 124) Case 899 To 1855 TaxMarried = 116.25 + 0.28 * (adjPay - 899) Case 1855 To 3084 TaxMarried = 383.93 + 0.31 * (adjPay - 1855) Case 3084 To 5439 TaxMarried = 764.92 + 0.36 * (adjPay - 3084) Case Is > 5439 TaxMarried = 1612.72 + 0.396 * (adjPay - 5439) End Select End Function Private Function TaxSingle(adjPay As Single) As Single ‘Task 6.2: Compute federal tax for single person based on adjusted pay Select Case adjPay Case 0 To 51 TaxSingle = 0 Case 51 To 517 TaxSingle = 0.15 * (adjPay - 51) Case 517 To 1105 TaxSingle = 69.6 + 0.28 * (adjPay - 517) Case 1105 To 2493 TaxSingle = 234.54 + 0.31 * (adjPay - 1105) Case 2493 To 5385 TaxSingle = 664.82 + 0.36 * (adjPay - 2493) Case Is > 5385 TaxSingle = 1705.94 + 0.396 * (adjPay - 5385) End Select End Function Private Function Total_Pay(prevPay As Single, pay As Single) ‘Compute total pay before taxes Total_Pay = prevPay + pay End Function COMMENTS A Case Study: Weekly Payroll 125 1. In the function FICA_Tax, care has been taken to avoid computing Social Security benefits tax on income in excess of $68,400 per year. The logic of the program makes sure an employee whose income crosses the $68,400 threshold during a given week is taxed only on the difference between $68,400 and his previous year-to-date income. 2. The two functions TaxMarried and TaxSingle use Select Case to incorporate the tax brackets given in Tables 4.4 and 4.5 for the amount of federal income tax withheld. The upper limit of each Case clause is the same as the lower limit of the next Case clause. This ensures fractional values for adjPay, such as 51.50 in
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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 107: FIGURE 3-9 Sample Run for Programmi
Page 111 and 112: 4.1 RELATIONAL AND LOGICAL OPERATOR
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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 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
Page 131: ‘Program to compute employees’
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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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174 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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