Computer Programming Concepts and Visual Basic David I. Schneider

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142 Computer Programming Concepts and Visual Basic values m, m + 1,..., n in order, and the body is executed once for each of these values. If m > n, then execution continues with the statement after the For...Next loop. When program execution reaches a For...Next loop, such as the one shown previously, the For statement assigns to the control variable ithe initial value m and checks to see whether it is greater than the terminating value n. If so, then execution jumps to the line following the Next statement. If i
Private Sub cmdDisplay_Click() Dim pop As Single, yr As Integer ‘Display population from 1998 to 2002 picTable.Cls pop = 300000 For yr = 1998 To 2002 picTable.Print yr, FormatNumber(pop, 0) pop = pop + .03 * pop Next yr End Sub [Run, and click the command button.] The initial and terminating values can be constants, variables, or expressions. For instance, the For statement in the preceding program can be replaced by firstYr = 1998 lastYr = 2002 For yr = firstYr To lastYr In Example 1, the control variable was increased by 1 after each pass through the loop. A variation of the For statement allows any number to be used as the increment. The statement For i= m To n Step s instructs the Next statement to add s to the control variable instead of 1. The numbers m, n, and s do not have to be whole numbers. The number s is called the step value of the loop. EXAMPLE 2 The following program displays the values of the index of a For...Next loop for terminating and step values input by the user. Object Property Setting frm6_3_2 Caption For index = 0 To n Step s lblN Caption n: txtEnd Text (blank) lblS Caption s: txtStep Text (blank) cmdDisplay Caption Display Values of index picValues Private Sub cmdDisplay_Click() Dim n As Single, s As Single, index As Single ‘Display values of index ranging from 0 to n Step s picValues.Cls n = Val(txtEnd.Text) s = Val(txtStep.Text) For index = 0 To n Step s For...Next Loops 143
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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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Page 119 and 120: picTax.Cls picTax.Print “Your FIC
Page 121 and 122: Case 4, 5 picOutcome.Print “You a
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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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192 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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