Computer Programming Concepts and Visual Basic David I. Schneider

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420 Computer Programming Concepts and Visual Basic HOW TO: MANAGE WINDOWS A. Enlarge the active window to fill the entire screen. 1. Click on the Maximize button (page icon; second icon from the right) on the Title bar of the window. 2. To return the window to its original size, click on the Restore (double-page) button that has replaced the Maximize button. B. Move a window. 1. Move the mouse to the title bar of the window. 2. Drag the window to the desired location. C. Change the size of a window. 1. Move the mouse to the edge of the window which is to be adjusted or to the corner joining the two edges to be adjusted. 2. When the mouse becomes a double arrow, drag the edge or corner until the window has the desired size. D. Close a window. 1. Click on the X button on the far right corner of the title bar. HOW TO: USE THE PRINTER A. Obtain a printout of a program. 1. Press Alt/F/P. 2. Press the Enter key. Note: To print just the text selected as a block or the active (current) window, use the direction keys to select the desired option. B. Obtain a printout of the form during run time. 1. Place the statement PrintForm in the Form_Click( ) or other appropriate procedure of the program which will be executed at the point when the desired output will be on the form. HOW TO: USE THE DEBUGGER A. Stop a program at a specified line. 1. Place the cursor on the desired line. 2. Press F9 or Alt/D/T to highlight the line in red. (This highlighted line is called a breakpoint. When the program is run it will stop at the breakpoint before executing the statement.) Note: To remove this breakpoint, repeat Steps 1 and 2.
B. Remove all breakpoints. 1. Press Alt/D/C or Ctrl+Shift+F9. C. Run a program one statement at a time. 1. Press F8. The first executable statement will be highlighted. (An event must first occur for which an event procedure has been written.) 2. Press F8 each time you want to execute the currently highlighted statement. Note: You will probably need to press Alt+Tab to switch back and forth between the form and the VB environment. Also, to guarantee that output is retained while stepping through the program, the AutoRedraw property of the form and any picture boxes may need to be set to True. D. Run the program one statement at a time, but execute each general procedure call without stepping through the statements in the procedure one at a time. 1. Press Shift+F8. The first executable statement will be highlighted. 2. Press Shift+F8 each time you want to execute the currently highlighted statement. E. Continue execution of a program that has been suspended. 1. Press F5. Note: Each time an attempt is made to change a suspended program in a way that would prevent the program from continuing, Visual Basic displays a dialog box warning that the program will have to be restarted from the beginning and gives the option to cancel the attempted change. F. Have further stepping begin at the line containing the cursor (no variables are cleared). 1. Press Alt/D/R or Ctrl+F8. G. Set the next statement to be run in the current procedure. 1. Place the cursor anywhere in the desired statement. 2. Press Alt/D/N or Ctrl+F9. H. Determine the value of an expression during run time. 1. Press Alt/D/A (Add Watch) 2. Type the expression into the Expression text box, adjust other entries in dialog box (if necessary), and click on OK. Note: The value of the expression will appear in the Watches window during break mode. or 1. In Break mode, hover the cursor over the variable to have its value displayed. Appendix B 421
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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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‘Student Class (CStudent) Private
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Page 379 and 380: ■ EVENTS In the previous section
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Page 391: S E C T I O N 13 COMMUNICATING WITH
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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 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
Page 477 and 478: 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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