Microsoft Visual Basic 2005: Reloaded
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1 Microsoft Visual Basic 2005: Reloaded Second Edition Chapter 5 Repeating Program Instructions
2 Objectives After studying this chapter, you should be able to: Include the repetition structure in pseudocode and in a flowchart Write a For...Next statement Calculate a periodic payment using the Financial.Pmt method Include a list box and a combo box in an interface Write a Do...Loop statement Microsoft Visual Basic 2005: Reloaded, Second Edition 2
3 Objectives (continued) Initialize and update counters and accumulators Display a dialog box using the InputBox function Create a multiline text box that cannot be edited Animate a control by moving it across a form Have the computer sound a beep Microsoft Visual Basic 2005: Reloaded, Second Edition 3
4 The Repetition Structure Repetition structure (or loop): a structure that repeatedly processes one or more program instructions until a condition is met Pretest loop The condition is evaluated before the instructions within the loop are processed The instructions may be processed 0 or more times Posttest loop The condition is evaluated after the instructions within the loop are processed The instructions are always processed at least once Microsoft Visual Basic 2005: Reloaded, Second Edition 4
5 The Repetition Structure (continued) Repetition statements in Visual Basic For...Next Do...Loop For Each...Next Microsoft Visual Basic 2005: Reloaded, Second Edition 5
6 The For...Next Statement For...Next statement Processes a set of instructions a known number of times Is a pretest loop Microsoft Visual Basic 2005: Reloaded, Second Edition 6
7 The For...Next Statement (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 7
8 The For...Next Statement (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 8
9 The For...Next Statement (continued) Startvalue, endvalue, and stepvalue items Control the number of times the loop is processed Must evaluate to numeric values Can be positive or negative A negative stepvalue causes the loop counter to count down Flowchart symbol for the For...Next loop is a hexagon Microsoft Visual Basic 2005: Reloaded, Second Edition 9
10 The For...Next Statement (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 10
11 The For...Next Statement (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 11
12 The For...Next Statement (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 12
13 The For...Next Statement (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 13
14 The Financial.Pmt Method Financial.Pmt method Calculates a periodic payment on a loan or investment Returns the periodic payment as a Double type value Rate and number of periods arguments must be expressed in the same units (monthly, annual, etc.) Also calculates the amount that must be saved each period to accumulate a specific sum Microsoft Visual Basic 2005: Reloaded, Second Edition 14
15 The Financial.Pmt Method (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 15
16 The Financial.Pmt Method (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 16
17 The Monthly Payment Calculator Application Microsoft Visual Basic 2005: Reloaded, Second Edition 17
18 The Monthly Payment Calculator Application (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 18
19 Selecting the Existing Text in a Text Box Windows standard: highlight the existing text when a text box receives the focus SelectAll method: selects all text in a text box Enter event: occurs when the text box receives the focus Microsoft Visual Basic 2005: Reloaded, Second Edition 19
20 Selecting the Existing Text in a Text Box (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 20
21 Selecting the Existing Text in a Text Box (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 21
22 Selecting the Existing Text in a Text Box (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 22
23 Coding a Control s TextChanged Event Procedure TextChanged event Occurs when a change is made in a control s Text property Change may be made by user or the program Microsoft Visual Basic 2005: Reloaded, Second Edition 23
24 Coding a Control s TextChanged Event Procedure (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 24
25 Coding a Control s TextChanged Event Procedure (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 25
26 Using a List Box in an Interface ListBox tool: creates a ListBox control ListBox control: displays a list of choices from which the user can select 0 or more choices SelectionMode property: controls the number of choices a user can select None: user can scroll but not select anything One: user can select one item MultiSimple and MultiExtended: user can select multiple items Microsoft Visual Basic 2005: Reloaded, Second Edition 26
27 Using a List Box in an Interface (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 27
28 Adding Items to a List Box Items collection: a collection of the items in a list box Collection: a group of one or more individual objects treated as one unit Index: A unique number that identifies an item in a collection Is zero-relative: the first item has index of 0 Add method: adds an item to the list box s Items collection Microsoft Visual Basic 2005: Reloaded, Second Edition 28
29 Adding Items to a List Box (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 29
30 Adding Items to a List Box (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 30
31 Adding Items to a List Box (continued) Sorted property: Determines if the list box items are sorted Sort order is dictionary order Microsoft Visual Basic 2005: Reloaded, Second Edition 31
32 Adding Items to a List Box (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 32
33 The SelectedItem and SelectedIndex SelectedItem property: Properties Contains the value of the selected item in the list If nothing is selected, it contains the empty string SelectedIndex property: Contains the index of the selected item in the list If nothing is selected, it contains the value -1 Default list box item: the item that is selected by default when the interface first appears Microsoft Visual Basic 2005: Reloaded, Second Edition 33
34 The SelectedItem and SelectedIndex Properties (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 34
35 The SelectedItem and SelectedIndex Properties (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 35
36 The SelectedValueChanged and SelectedIndexChanged Events SelectedValueChanged and SelectedIndexChanged events: occur when a user selects an item in a list box Microsoft Visual Basic 2005: Reloaded, Second Edition 36
37 The SelectedValueChanged and SelectedIndexChanged Events (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 37
38 Modifying the Monthly Payment Calculator Application Microsoft Visual Basic 2005: Reloaded, Second Edition 38
39 Modifying the Monthly Payment Calculator Application (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 39
40 Modifying the Monthly Payment Calculator Application (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 40
41 Using a Combo Box in an Interface ComboBox tool: creates a combo box control ComboBox control: Similar to a list box May contain a text field that allows the user to type an entry that is not on the list List portion may be hidden Three styles of combo boxes: Simple DropDown DropDownList Microsoft Visual Basic 2005: Reloaded, Second Edition 41
42 Using a Combo Box in an Interface (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 42
43 Using a Combo Box in an Interface (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 43
44 Using a Combo Box in an Interface (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 44
45 Using a Combo Box in an Interface (continued) SelectedItem property: contains the value of the selected item in the list Text property: contains the value that appears in the text portion of the control (item selected or typed in) Microsoft Visual Basic 2005: Reloaded, Second Edition 45
46 Using a Combo Box in an Interface (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 46
47 Using a Combo Box in an Interface (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 47
48 Using a Combo Box in an Interface (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 48
49 Using a Combo Box in an Interface (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 49
50 The Do...Loop Statement Do...Loop statement: codes both a pretest or a posttest loop Use While or Until to code the condition for the loop Repetition symbol in a flowchart is the diamond Microsoft Visual Basic 2005: Reloaded, Second Edition 50
51 The Do...Loop Statement (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 51
52 The Do...Loop Statement (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 52
53 The Do...Loop Statement (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 53
54 The Do...Loop Statement (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 54
55 The Do...Loop Statement (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 55
56 The Do...Loop Statement (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 56
57 The Do...Loop Statement (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 57
58 The Do...Loop Statement (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 58
59 Using Counters and Accumulators Counter: a numeric variable used for counting Accumulator: a numeric variable used for accumulating Initializing: assigning a beginning value to a variable Updating (or incrementing): adding a number to the value of a variable Counters are always incremented by a constant value, usually 1 Microsoft Visual Basic 2005: Reloaded, Second Edition 59
60 The InputBox Function InputBox function: displays a predefined dialog box Contains a text message, an OK button, a Cancel button, and an input area Function: a predefined procedure that performs a specific task and returns a value InputBox function returns: The user s entry if the user clicks the OK button An empty string if the user clicks the Cancel button or the Close button on the title bar Microsoft Visual Basic 2005: Reloaded, Second Edition 60
61 The InputBox Function (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 61
62 The InputBox Function (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 62
63 The Sales Express Application Microsoft Visual Basic 2005: Reloaded, Second Edition 63
64 The Sales Express Application (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 64
65 The Sales Express Application (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 65
66 The Sales Express Application (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 66
67 The Sales Express Application (continued) Microsoft Visual Basic 2005: Reloaded, Second Edition 67
68 Programming Tutorial Microsoft Visual Basic 2005: Reloaded, Second Edition 68
69 Programming Example Microsoft Visual Basic 2005: Reloaded, Second Edition 69
70 Summary Repetition structure (or loop): repeatedly processes a set of instructions Pretest loop tests the condition before the instructions are processed Posttest loop tests the condition after the instructions are processed For...Next statement: a pretest loop that will process the instructions a fixed number of times Financial.Pmt method: calculates a periodic payment on a loan or investment Microsoft Visual Basic 2005: Reloaded, Second Edition 70
71 Summary (continued) SelectAll method: highlights text in a text box TextChanged Event: occurs when a control s text changes List box s Items collection: adds an item to the list SelectedItem property of a list box: contains the value of the selected item in the list SelectedIndex property of a list box: contains the index position of the selected item in the list Microsoft Visual Basic 2005: Reloaded, Second Edition 71
72 Summary (continued) Combo box: similar to a list box but may not expose the list items until clicked Three styles of combo boxes: Simple, DropDown, and DropDownList Do...Loop statement: codes a pretest or posttest loop Use a While or Until condition in a Do...Loop Flowchart symbol for repetition is a diamond Microsoft Visual Basic 2005: Reloaded, Second Edition 72
73 Summary (continued) Counter and accumulators: variables that calculate subtotals, totals, and averages InputBox function: allows user input Console.Beep method: plays the sound of a beep through the computer s console speakers Microsoft Visual Basic 2005: Reloaded, Second Edition 73
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