Visual Basic 2005 Demysti ed in Java

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Visual Basic 2005 Demysti ed
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By contrast, independent If statements are used to determine whether to add 50 cents for each topping, based on whether each check box s value is True Independent If statements are appropriate because the value of each check box is independent from that of the others The user may choose all toppings, no toppings, or any combination Finally, the value of dblTotal is displayed in the Total label This involves two steps First, the value is converted from a Double to a String data type using the ToString method because that value is being assigned to a property (Text) that is a String data type Second, the argument c is passed to the ToString method so the total is formatted as currency, starting with the dollar sign ($) and having two numbers, no more and no less, to the right of the decimal point N OTE The argument c to the ToString method is a format specifier There are other format specifiers, such as e for exponential or scientific notation and p for percentage
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Restoring the Application to Its Initial Settings
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Finally, the following code in the Click event procedure of the Clear button returns the application to its default settings (large size, all toppings unchecked, cost blank):
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Private Sub btnClear_Click _ (ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) Handles btnClearClick radLargeChecked = True radMediumChecked = False radSmallChecked = False chkMushroomChecked = False chkPepperoniChecked = False chkAnchovyChecked = False lblTotalText = "" End Sub
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Select Case Control Structure
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The Select Case control structure is quite similar to the IfElseIf statement, but they are not the same The primary difference is that, in the IfElseIf statement, the If and ElseIf clauses each may evaluate completely different expressions, whereas
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CHAPTER 7 Making Choices If and Select Case Control Structures
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a Select Case control structure may evaluate only one expression, which then must be used for every comparison For example, the condition of an If clause could be whether Night > Day (the condition of the following ElseIf clause), whether Citizenship = US (the condition of the next ElseIf clause), whether NumberOfClasses >= 4, and so on Usually the conditions evaluated by the If and ElseIf clauses are related, but they can be completely independent of each other By contrast, the Select Case control structure evaluates one test expression, and that test expression is used for all the following comparisons
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Syntax
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The syntax of a Select Case control structure is shown here:
Select Case [test expression] Case [expression or expression list] [code] ' More Case statements optional Case Else 'also optional [code] End Select
The test expression may be a variable, constant, property, or expression The expression or expression list following the Case clause is compared to the expression or expression list, and may be one of the following: An expression, such as Case 80 This means that the condition is whether the test expression equals the expression (in this example, whether the test expression equals 80) An expression list, such as Case 80 To 90 This means that the condition is whether the test expression equals a value within the expression list (here, 80 through 90) If the values are not consecutive, then commas can delimit them For example, Case 1 To 4, 7 To 9, 11 means that the condition is whether the test expression equals 1 through 4, or 7 through 9, or 11
The Is Keyword
The Is keyword is combined with a comparison operator For example, Case Is > 8 means that the condition is whether the test expression is greater than 8 These alternatives can be combined For example, Case 1 To 3, 5, Is > 8 means that the condition is whether the text expression is 1 through 3, 5, or greater than 8
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