Computer Programming Concepts and Visual Basic David I. Schneider

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120 Computer Programming Concepts and Visual Basic TABLE 4.3 Payroll Information Current Yr. to Date FICA Income Check Name Earnings Earnings Taxes Tax Wh. Amount Al Clark$1,729.00 $70,654.50 $25.07 $290.50 $1,413.43 TABLE 4.4 1998 Federal Income Tax Withheld for a Single Person Paid Weekly Adjusted Weekly Income Income Tax Withheld $0 to $51 $0 Over $51 to $517 15% of amount over $51 Over $517 to $1,105 $69.90 + 28% of excess over $517 Over $1,105 to $2,493 $234.54 + 31% of excess over $1,105 Over $2,493 to $5,385 $664.82 + 36% of excess over $2,493 Over $5,385 $1,705.94 + 39.6% of excess over $5,385 TABLE 4.5 1998 Federal Income Tax Withheld for a Married Person Paid Weekly Adjusted Weekly Income Income Tax Withheld $0 to $124 $0 Over $124 to $899 15% of excess over $124 Over $899 to $1,855 $116.25 + 28% of excess over $899 Over $1,855 to $3,084 $383.93 + 31% of excess over $1,855 Over $3,084 to $5,439 $764.92 + 36% of excess over $3,084 Over $5,439 $1,612.72 + 39.6% of excess over $5,439 ■ DESIGNING THE WEEKLY PAYROLL PROGRAM After the data for an employee have been gathered from the text boxes, the program must compute the five items appearing in Table 4.3 and then display the payroll information. The five computations form the basic tasks of the program. 1. Compute current earnings. 2. Compute year-to-date earnings. 3. Compute FICA tax. 4. Compute federal income tax withheld. 5. Compute paycheck amount (that is, take-home pay). Tasks 1, 2, 3, and 5 are fairly simple. Each involves applying a formula to given data. (For instance, if hours worked is at most 40, then Current Earnings = Hourly Wage times Hours Worked.) Thus, we won’t break down these tasks any further. Task 4 is more complicated, so we continue to divide it into smaller subtasks. 4. Compute Federal Income Tax Withheld. First, the employee’s pay is adjusted for exemptions, and then the amount of income tax to be withheld is computed. The computation of the income tax withheld differs for married and single individuals. Task 4 is, therefore, divided into the following subtasks: 4.1 Compute pay adjusted by exemptions. 4.2 Compute income tax withheld for single employee. 4.3 Compute income tax withheld for married employee.
The hierarchy chart in Figure 4-4 shows the stepwise refinement of the problem. FIGURE 4-4 Hierarchy Chart for the Weekly Payroll Program ■ PSEUDOCODE FOR THE DISPLAY PAYROLL EVENT INPUTemployee data (Sub procedure InputData) COMPUTE CURRENT GROSS PAY (Function Gross_Pay) COMPUTE TOTAL EARNINGS TO DATE (Function Total_Pay) COMPUTE FICA TAX (Function FICA_Tax) COMPUTE FEDERAL TAX (Function Fed_Tax) Adjust pay for exemptions If employee is single Then COMPUTE INCOME TAX WITHHELD from adjusted pay using tax brackets for single taxpayers (Function TaxSingle) Else COMPUTE INCOME TAX WITHHELD from adjusted pay using taxbrackets for married taxpayers (Function TaxMarried) End If COMPUTE CHECK (Function Net_Check) Display payroll information (Sub procedure ShowPayroll) ■ WRITING THE WEEKLY PAYROLL PROGRAM The cmdDisplay event procedure calls a sequence of seven procedures. Table 4.6 shows the tasks and the procedures that perform the tasks. TABLE 4.6 Tasks and Their Procedures Task Procedure 0. Input employee data. InputData 1. Compute current earnings. Gross_Pay 2. Compute year-to-date earnings. Total_Pay 3. Compute FICA tax. FICA_Tax 4. Compute federal income tax withheld. Fed_Tax 4.1 Compute adjusted pay. Fed_Tax 4.2 Compute amount withheld for single employee. TaxSingle 4.3 Compute amount withheld for married employee. TaxMarried 5. Compute paycheck amounts. Net_Check 6. Display payroll information. ShowPayroll A Case Study: Weekly Payroll 121
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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 97 and 98: Private Sub cmdDetermine_Click() Di
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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
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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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170 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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