Computer Programming Concepts and Visual Basic David I. Schneider

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152 Computer Programming Concepts and Visual Basic msg = “Please enter year (1-”& Str(numMs / 12) msg = msg & “) for which amorization is to be shown:” startMonth = 12 * Val(InputBox(msg)) - 11 picDisp.Cls picDisp.Print “”, “Amount Paid “, picDisp.Print “Amount Paid”, “Balance at” picDisp.Print “Month”, “for Principal”, picDisp.Print “for Interest”, “End of Month” mRate = yearlyRate / 12 ‘monthly rate monthlyPayment = Payment(prin, mRate, numMs) totalInterest = 0 yearInterest = 0 oldBalance = prin For monthNum = 1 To numMs newBalance = Balance(monthlyPayment, oldBalance, mRate) principalPaid = oldBalance - newBalance interestPaid = monthlyPayment - principalPaid totalInterest = totalInterest + interestPaid If (monthNum >= startMonth) And (monthNum yearlyRate + .01 End Sub Private Sub ShowPayment(prin As Single, yearlyRate As Single, numMs As Integer) Dim mRate As Single, prn As String, apr As String
Dim yrs As String, pay As Single, pymnt As String ‘Display monthly payment amount mRate = yearlyRate / 12 ‘monthly rate prn = FormatCurrency(prin) apr = FormatNumber(yearlyRate * 100) yrs = FormatNumber(numMs / 12, 0) pay = Payment(prin, mRate, numMs) pymnt = FormatCurrency(pay) picDisp.Cls picDisp.Print “The monthly payment for a “& prn & “loan at “ picDisp.Print apr & “% annual rate of interest for “; picDisp.Print yrs & “years is “& pymnt End Sub COMMENTS 1. Tasks 3.1 and 3.2 are performed by functions. Using functions to compute these quantities simplifies the computations in ShowAmortSched. 2. Because the payment was rounded up to the nearest cent, it is highly likely that the payment needed in the final month to pay off the loan will be less than the normal payment. For this reason, ShowAmortSched checks if the balance of the loan (including interest due) is less than the regular payment, and if so, makes appropriate adjustments. 3. The standard formula for computing the monthly payment cannot be used if either the interest rate is zero percent or the loan duration is zero months. Although both of these situations do not represent reasonable loan parameters, provisions are made in the function Payment so that the program can handle these esoteric situations. SUMMARY 1. A Do loop repeatedly executes a block of statements either as long as or until a certain condition is true. The condition can be checked either at the top of the loop or at the bottom. 2. The EOF function tells us if we have read to the end of a file. 3. As various items of data are processed by a loop, a counter can be used to keep track of the number of items, and an accumulator can be used to sum numerical values. 4. A flag is a Boolean variable, used to indicate whether or not a certain event has occurred. 5. A For...Next loop repeats a block of statements a fixed number of times. The control variable assumes an initial value and increments by one after each pass through the loop until it reaches the terminating value. Alternative increment values can be specified with the Step keyword. PROGRAMMING PROJECTS 1. Write a program to display a company’s payroll report in a picture box. The program should read each employee’s name, hourly rate, and hours worked from a Programming Projects 153
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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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FIGURE 3-9 Sample Run for Programmi
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Page 121 and 122: Case 4, 5 picOutcome.Print “You a
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202 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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