BRANCHING AND LOOPING in .NET

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BRANCHING AND LOOPING
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Write a loop that will examine each character in a string called Text and determine how many of the characters are vowels and how many are consonants. Hint: First determine whether or not a character is a letter; if so, determine the type of letter. Also, see the suggestion given at the end of Problem 3.45.
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Write a loop that will display the characters in a string in reverse order (so that the string will appear backwards). Hint: See the suggestion at the end of Problem 3.45.
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Describe the final value of x that is generated by each of the following Visual Basic program segments. (a) i = 0
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x = 0 Do While (i < 20) If (i Mod 5 = 0) Then x = x + i i = i + 1 Loop
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(b) i = 0
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x = 0 Do If (i Mod 5 = 0) Then x = x + 1 i = i + 1 Loop While (i < 20)
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(c) x = 0
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For i = 1 To 10 Step 2 x = x + 1 Next i
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(d) x = 0
For i = 1 To 10 Step 2 x = x + i Next i
x = 0 For i = 1 To 10 IF (i Mod 2 = 1) Then x = x + i Else x = x 1 End If Next i x = 0 For i = 1 To 10 If (i Mod 2 = 1) Then x = x + i Else x = x 1 End If Exit For Next i
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BRANCHING AND LOOPING
(g) x = 0
For i = 0 To 4 For j = 0 To i 1 x = x + (i + j 1) Next j Next i
(h) x = 0
For i = 0 To 4 For j = 0 To i 1 x = x + (i + j 1) Exit For Next j Next i
x = 0 For i = 0 To 4 For j = 0 To i x = x + j Next j Exit For Next i x = 0 For i = 0 To 4 For j = 0 To i 1 k = (i + j 1) If (k Mod 2 = 0) Then x = x + k ElseIF (k Mod 3 = 0) Then x = x + k 2 End If Next j Next i x = 0 For i = 0 To 4 For j = 0 To i 1 Select Case (i + j 1) Case -1, 0 x = x + 1 Case 1, 2, 3 x = x + 2 Case Else x = x + 3 End Select Next j Next i
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4
Visual Basic Control Fundamentals
4.1 VISUAL BASIC CONTROL TOOLS In 1 we saw that the Visual Basic Toolbox (shown below in Fig. 4.1) contains a collection of control tools, such as labels, text boxes and command buttons. These controls, together with customized menus, allow us to build a broad variety of graphical user interfaces. In this chapter we will focus on several of the more commonly used Toolbox control tools. These tools, together with the material covered in the previous two chapters, will allow us to write complete Visual Basic programs.
Pointer
Picture Box
Label
Text Box
Frame
Command Button
Check Box
Option Button
Combo Box
List Box
Horizontal Scroll Bar
Vertical Scroll Bar
Timer
Drive List Box
Directory List Box
File List Box
Shape (Drawing)
Line (Drawing)
Image Box
Data
OLE Container
Fig. 4.1 The Visual Basic toolbox
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VISUAL BASIC CONTROL FUNDAMENTALS
Here, in alphabetical order, is a brief description of each control tool: Check Box Provides a means of specifying a Yes/No response. Within a group of check boxes, any number of boxes can be checked, including none. (See also the Option Box description.) Combo Box Combines the capabilities of a text box and a list box. Thus, it provides a collection of text items, one of which may be selected from the list at any time during program execution. Text items can be assigned initially, or they can be assigned during program execution. In addition, the user can enter a text item at any time during program execution. Command Button Provides a means of initiating an event action by the user clicking on the button.
Data Provides a means of displaying information from an existing database. Directory List Box Provides a means of selecting paths and directories (folders) within the current drive. Drive List Box Provides a means of selecting among existing drives. File List Box Provides a means of selecting files within the current directory. Frame Provides a container for other controls. It is usually used to contain a group of option buttons, check boxes or graphical shapes. Horizontal Scroll Bar Allows a horizontal scroll bar to be added to a control (if a horizontal scroll bar is not included automatically). Image Box Used to display graphical objects, and to initiate event actions. (Note that an Image Box is similar to a Picture Box. It redraws faster and can be stretched, though it has fewer properties than a Picture Box.) Label Used to display text on a form. The text cannot be reassigned during program execution, though it can be hidden from view and its appearance can be altered. (See also the Text Box description.)
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