Computer Programming Concepts and Visual Basic David I. Schneider

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418 Computer Programming Concepts and Visual Basic lines. If the text box is not tall enough, lines will scroll up out of view, but can be redisplayed by moving the cursor up.) H. Assign an access key to a label or command button. 1. When assigning a value to the Caption property, precede the desired access key character with an ampersand (&). I. Allow a particular command button to be activated by a press of the Enter key. 1. Set the command button’s Default property to True. Note: Setting the Default property True for one command button automatically sets the property to False for all the other command buttons on the form. J. Adjust the order in which the Tab key moves the focus. 1. Select the first control in the tabbing sequence. 2. Change the setting of the TabIndex property for this control to 0. 3. Select the next control in the tabbing sequence. 4. Change the setting of the TabIndex property for this control to 1. 5. Repeat Steps 3 and 4 (adding 1 to the Tab Index property) until all controls on the form have been assigned a new TabIndex setting. Note: In Steps 2 and 4, if an object is moved to another position in the sequence, then the TabIndex property for the other objects will be renumbered accordingly. K. Allow the pressing of Esc to activate a particular command button. 1. Set the command button’s Cancel property to True. (Setting the Cancel property to True for one command button automatically sets it to False for all other command buttons.) L. Keep the contents of a picture box from being erased accidentally. 1. Set the picture box’s AutoRedraw property to True. (The default is False. Unless the property is set to True, the contents will be erased when the picture box is obscured by another window.) HOW TO: MANAGE PROCEDURES A. Access the Code window. 1. Press Alt/V/C or F7. (If the Code window does not appear, run and then terminate the program.) or 1. Press Alt/V/P to activate the Project Explorer window. 2. Select the name of the form. 3. Click on the “View Code”button. B. Look at an existing procedure. 1. Access the Code window. 2. Press Ctrl+Down Arrow or Ctrl+Up Arrow to see all the procedures. or 1. Access the Code window. 2. Click on the down arrow at the right of the Object box and then select an object. [For general procedures select (General) as the Object.]
3. Click on the down arrow at the right of the Procedure box and then select a procedure. C. Create a general procedure. 1. Access the Code window. 2. Move to a blank line that is not inside a procedure. 3. Type Private Sub (for a Sub procedure) or Private Function (for a Function procedure) followed by the name of the procedure and any parameters. 4. Press the Enter key. (The Code window will now display the new procedure heading and an End Sub or End Function statement.) 5. Type the procedure into the Code Window. or 1. Access the Code window. 2. Press Alt/T/P. (A dialog box will appear.) 3. Type the name of the procedure into the Name rectangle. 4. Select the type of procedure. 5. Select the Scope by clicking on Public or Private. (In this book, we always use Private.) 6. Press the Enter key. (The Code window will now display the new procedure heading and an End Sub or End Function statement.) 7. Type the procedure into the Code Window. D. Alter a procedure. 1. View the procedure in the Code Window as described in item B of this section. 2. Make changes as needed. E. Remove a procedure. 1. Bring the procedure into the Code Window as described in item B of this section. 2. Mark the entire procedure as a block. That is, a. Press Ctrl+PgUp to move the cursor to the beginning of the procedure. b. Hold down the Shift key and press Ctrl+PgDn to move the cursor to the start of the next procedure. c. Press the Up Arrow key until just after the end of the procedure to be deleted. 3. Press the Del key. F. Insert an existing procedure into a program. 1. Open the program containing the procedure. 2. View the procedure in the Code Window as described in item B of this section. 3. Mark the entire procedure as a block, as described in step 2 of item E of this section. 4. Press Ctrl+C to place the procedure into the clipboard. 5. Open the program in which the procedure is to be inserted and access the Code Window. 6. Move the cursor to a blank line. 7. Press Ctrl+V to place the contents of the clipboard into the program. Appendix B 419
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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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4.1 RELATIONAL AND LOGICAL OPERATOR
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(a) (2 < n) And (n < 6) (b) (2 < n)
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SOLUTION: In the following program,
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The Else part of an If block can be
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picTax.Cls picTax.Print “Your FIC
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Case 4, 5 picOutcome.Print “You a
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EXAMPLE 3 The following program use
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Case Else picResult.Print “The st
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4. The items in the value list must
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The hierarchy chart in Figure 4-4 s
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‘Program to compute employees’
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Private Function TaxMarried(adjPay
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and tells us whether the food meets
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S E C T I O N 5 REPETITION
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132 Computer Programming Concepts a
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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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Page 379 and 380: ■ EVENTS In the previous section
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Page 413: A P P E N D I C E S
Page 431 and 432: APPENDIX C VISUAL BASIC STATEMENTS,
Page 433 and 434: CANCEL The Cancel property provides
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Page 437 and 438: DEFINT, DEFLNG, DEFSNG, DEFDBL, DEF
Page 439 and 440: ENVIRON Visual Basic has an environ
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Page 447 and 448: ISNUMERIC The value of the function
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Page 461 and 462: UNLOCK The Unlock command is intend
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Page 475 and 476: 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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