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Visual Basic 2005 Demysti ed
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Nesting
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As the preceding example in the section on the Exit For statement shows, you can nest an IfEnd If statement in a ForNext statement Try the following code, which will print each number between 1 and 100 that is evenly divisible by 3:
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Private Sub Form1_Load(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) Handles MeLoad DebugWriteLine _ ("Every multiple of 3 between 1 and 100:") For x As Integer = 1 To 100 If x Mod 3 = 0 Then DebugWriteLine (x) End If Next x DebugWriteLine ("This line will always print") End Sub
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You also can nest ForNext loops by placing one loop within another Each loop must have a different counter variable Try the following code:
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Private Sub Form1_Load(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) Handles MeLoad For I As Integer = 1 To 3 For X As Integer = 1 To 3 DebugWriteLine ("I = " & I) DebugWriteLine ("X = " & X) Next X Next I DebugWriteLine ("This line will always print") End Sub
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The output is shown here:
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I X I X I X I X I X = = = = = = = = = = 1 1 1 2 1 3 2 1 2 2
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I = 2 X = 3 I = 3 X = 1 I = 3 X = 2 I = 3 X = 3 This line will always print
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Nesting ForNext loops often is used to print values in the rows and columns of a table The outside ForNext loop represents the rows, and the inside ForNext loop represents the columns
WhileEnd While Statement
The WhileEnd While statement repeats the execution of a statement as long as a given condition is True The syntax is shown here:
While condition [ statements ] End While
The following code example shows a WhileEnd While statement in action It prints 1 through 5 to the Output window:
Private Sub Form1_Load(ByVal sender As SystemObject, _ ByVal e As SystemEventArgs) Handles MeLoad Dim x As Integer = 1 While x <= 5 DebugWriteLine(x) x += 1 End While DebugWriteLine("This line will always print") End Sub
The condition is x <= 5 If that condition is True, all the statements within the WhileEnd While statement are executed When the End While statement is reached, execution returns to the While statement and the condition is again checked If the condition is still True, the process is repeated If it is False, execution resumes with the statement following the End While statement The condition is x <= 5 The starting value of x is 1, so at the beginning, the condition x <= 5 is True Therefore, both statements within the WhileEnd While statement are executed; the value of x, at this time 1, is outputted, and then is incremented so the new value of x is 2
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When the End While statement is reached, execution returns to the While statement and the condition is again checked The value of x is now 2, so the condition still is True because 2 <= 5 Accordingly, once again the value of x is outputted and then increased by 1 to become 3 The End While statement is reached, so execution returns to the While statement and the condition is again checked The value of x is now 3, so the condition still is True because 3 <= 5 Accordingly, once again the value of x is outputted and then increased by 1 to become 4 The End While statement again is reached, so execution returns to the While statement and the condition is checked once again The value of x is now 4, so the condition still is True because 4 <= 5 Accordingly, once again the value of x is outputted and then increased by 1 to become 5 The End While statement is reached, so execution returns to the While statement and the condition is again checked The value of x is now 5, so the condition still is True because 5 <= 5 Accordingly, once again the value of x is outputted and then increased by 1 to become 6 Now when execution returns to the While statement and the condition is checked, the condition no longer is True because 6 <= 5 is False Accordingly, the statements within the WhileEnd While statement are not executed Instead, execution continues with the code that follows the WhileEnd While statement ( This line will always print )
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