Computer Programming Concepts and Visual Basic David I. Schneider

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150 Computer Programming Concepts and Visual Basic ■ PSEUDOCODE FOR THE ANALYZE-A-LOAN PROGRAM Calculate Monthly Payment command button: INPUT LOAN DATA (Sub procedure InputData) COMPUTE MONTHLY PAYMENT (Function Payment) DISPLAY MONTHLY PAYMENT (Sub procedure ShowPayment) Display Interest Rate Change Table command button: INPUT LOAN DATA (Sub procedure InputData) DISPLAY INTEREST RATE CHANGE TABLE (Sub procedure ShowInterestChanges) Decrease annual rate by .01 Do Display monthly interest rate COMPUTE MONTHLY PAYMENT (Function Payment) Increase annual rate by .00125 Loop Until annual rate > original annual rate + .01 Display Amortization Schedule command button: INPUT LOAN DATA (Sub procedure InputData) DISPLAY AMORTIZATION SCHEDULE (Sub procedure ShowAmortSched) Compute monthly interest rate COMPUTE MONTHLY PAYMENT (Function Payment) Display amortization table Display total interest paid TABLE 5.2 Tasks and Their Procedures ‘Analyze a loan Task Procedure 1. Input principal, interest, duration. InputData 2. Calculate monthly payment. ShowPayment 3. Calculate amortization schedule. ShowAmortSched 3.1 Calculate monthly payment. Payment 3.2 Calculate new balance. Balance 3.3 Calculate amount paid for loan. ShowAmortSched 3.4 Calculate amount paid for interest. ShowAmortSched 4. Show effect of interest rate changes. ShowInterestChanges 4.1 Reduce interest rate. ShowInterestChanges 4.2 Compute new monthly payment. Payment 4.3 Increase interest rate. ShowInterestChanges Private Function Balance(mPayment As Single, prin As Single, mRate As Single) As Single Dim newBal As Single ‘Compute balance at end of month newBal = (1 + mRate) * prin If newBal
Call InputData(principal, yearlyRate, numMonths) Call ShowAmortSched(principal, yearlyRate, numMonths) End Sub Private Sub cmdPayment_Click() Dim principal As Single ‘Amount of loan Dim yearlyRate As Single ‘Annual rate of interest Dim numMonths As Integer ‘Number of months to repay loan Call InputData(principal, yearlyRate, numMonths) Call ShowPayment(principal, yearlyRate, numMonths) End Sub Private Sub cmdQuit_Click() End End Sub Private Sub cmdRateTable_Click() Dim principal As Single ‘Amount of loan Dim yearlyRate As Single ‘Annual rate of interest Dim numMonths As Integer ‘Number of months to repay loan Call InputData(principal, yearlyRate, numMonths) Call ShowInterestChanges(principal, yearlyRate, numMonths) End Sub Private Sub InputData(prin As Single, yearlyRate As Single, numMs As Integer) Dim percentageRate As Single, numYears As Integer ‘Input the loan amount, yearly rate of interest, and duration prin = Val(txtAmt.Text) percentageRate = Val(txtApr.Text) numYears = Val(txtYrs.Text) yearlyRate = percentageRate / 100 numMs = numYears * 12 End Sub Private Function Payment(prin As Single, mRate As Single, numMs As Integer) As Single Dim payEst As Single If numMs = 0 Then payEst = prin ElseIf mRate = 0 Then payEst = prin / numMs Else payEst = prin * mRate / (1 - (1 + mRate) ^ (-numMs)) End If If payEst Round(payEst, 2) Then Payment = Round(payEst + .005, 2) ‘round up to nearest cent End If End Function Private Sub ShowAmortSched(prin As Single, yearlyRate As Single, numMs As Integer) Dim msg As String, startMonth As Integer, mRate As Single Dim monthlyPayment As Single, totalInterest As Single Dim yearInterest As Single, oldBalance As Single Dim monthNum As Integer, newBalance As Single Dim principalPaid As Single, interestPaid As Single Dim reducPrin As Single, loanYears As Integer ‘Display amortization schedule A Case Study: Analyze a Loan 151
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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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Page 167: S E C T I O N 6 ARRAYS
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200 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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