Computer Programming Concepts and Visual Basic David I. Schneider

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90 Computer Programming Concepts and Visual Basic Object Property Setting frm4_3_3 Caption Right Triangle lblSideOne Caption Length of one side txtSideOne Text (blank) lblSideTwo Caption Length of other side txtSideTwo Text (blank) cmdCalculate Caption Calculate Hypotenuse lblHyp Caption Length of hypotenuse picHyp Private Sub cmdCalculate_Click() Dim a As Single, b As Single ‘Calculate length of the hypotenuse of a right triangle a = Val(txtSideOne.Text) b = Val(txtSideTwo.Text) picHyp.Cls picHyp.Print Hypotenuse(a, b) End Sub Private Function Hypotenuse(a As Single, b As Single) As Single ‘Calculate the hypotenuse of a right triangle ‘having sides of lengths a and b Hypotenuse = Sqr(a ^ 2 + b ^ 2) End Function [Run, type 3 and 4 into the text boxes, and then click the command button.] EXAMPLE 4 The following program uses the future value function. With the responses shown, the program computes the balance in a savings account when $100 is deposited for 5 years at 4% interest compounded quarterly. Interest is earned 4 times per year at the rate of 1% per interest period. There will be 4 * 5 or interest periods. Object Property Setting frm4_3_4 Caption Bank Deposit lblAmount Caption Amount of bank deposit txtAmount Text (blank) lblRate Caption Annual rate of interest txtRate Text (blank) lblNumComp Caption Number of times interest is compounded per year txtNumComp Text (blank) lblNumYrs Caption Number of years txtNumYrs Text (blank) cmdCompute Caption Compute Balance lblBalance Caption Balance picBalance
Private Sub cmdCompute_Click() Dim p As Single, r As Single, c As Single, n As Single ‘Find the future value of a bank deposit Call InputData(p, r, c, n) Call DisplayBalance(p, r, c, n) End Sub Private Sub DisplayBalance(p As Single,r As Single,c As Single,n As Single) Dim balance As Single ‘Display the balance in the picture box picBalance.Cls balance = FV(p, r, c, n) picBalance.Print FormatCurrency(balance) End Sub Private Function FV(p As Single,r As Single,c As Single,n As Single) As Single Dim i As Single, m As Single ‘Find the future value of a bank savings account ‘p principal, the amount deposited ‘r annual rate of interest ‘c number of times interest is compounded per year ‘n number of years ‘i interest rate per period ‘m total number of times interest is compounded i = r / c m = c * n FV = p * ((1 + i) ^ m) End Function Private Sub InputData(p As Single, r As Single, c As Single, n As Single) ‘Get the four values from the text boxes p = Val(txtAmount.Text) r = Val(txtRate.Text) c = Val(txtNumComp.Text) n = Val(txtNumYrs.Text) End Sub [Run, type 100, .04, 4, and 5 into the text boxes, then click the command button.] EXAMPLE 5 Some computer languages have a useful built-in function called Ceil that is similar to the function Int, except that it rounds noninteger numbers up to the next integer. For instance, Ceil(3.2) is 4 and Ceil(–1.6) is –1. The following program creates Ceil in Visual Basic as a user-defined function. Function Procedures 91
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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 91 and 92: Call CalculateSum(x, y, s) Call Dis
Page 93 and 94: ■ FORM-LEVEL VARIABLES Visual Bas
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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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S E C T I O N 6 ARRAYS
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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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