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vba for loop
For i = 1 to 100 'Code here is executed 100 times. Next ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 'Notes: The For loop is terminated with the 'Next' keyword. There is no need ' to include the counter variable as part of Next, for example: "Next i". ' ' However, there is nothing wrong with doing so and some programmers feel ' including the counter variable improves readability. I don't. ' ' The speed of the loop is not affected by this decision. However, ' the speed of the loop IS affected by the choice of the type of variable ' used as the counter. A Long (&) is the quickest variable type ' to choose for the counter variable. ' ' In the above example, the range to iterate over is hard coded with ' constant values, 1 to 100. Variables or even expressions can be ' used intead of constant values. This adds significant dynamicism ' to the For loop. ' ' BUT, the variables or expressions used in the For loop range are ' evaluated only ONCE (before the loop starts). This makes ' the execution of the For loop efficient. ' ' However, this also means that changing the value of these variables ' DURING the For loop execution does NOT alter the original range ' that the For loop iterates over: a = 1 b = 100 For i = a to b b = 5 'This For loop still iterates 100 times Next ' A For loop can be exited EARLY by use of the 'Exit For' statement: For i = a to b If str = "abc" Then Exit For Next ' In the above sample code, if the variable 'str' ever equals ' "abc", then the For loop will instantly terminate, even if ' the range in not fully iterated. ' ' When 'Exit For' executes, execution resumes on the very next ' line of code following the 'Next' statement. If the For loop ' was nested inside of another loop, the nearest outer loop now ' continues execution. If the For loop is within a 'Function' or ' a 'Sub', there are two other options to exit the For loop early. ' Both 'Exit Function' and 'Exit Sub' will immediately terminate ' the For loop... but they will also immediately end the execution ' of, and immediately exit from, the current procedure. ' By default the For loop iterates in steps of positive ONE. This ' can be adjusted with the optional 'Step' keyword: For i = 1000 to 0 Step -10 'This loop iterates from 1000 to 0 (reverse iteration) by 10s. 'So i will equal 1000, 990, 980, 970... 0. Next ' Step values can be positive or negative. VBA's compiler will not prevent ' you from using a ZERO value for the Step value, but don't do this unless ' you really want to. It creates an INFINITE loop with the value of the ' counter variable ALWAYS equal to the start value. ' ' Step values can be variables or expressions that evaluate to any numeric ' type. But be careful about floating point values. Floating point ' Step values may work... even for a long time... and then fail ' unpredictably (which can make debugging extremely difficult). Integer ' Step values are safe, always. And again, the Long (&) integer will ' allow the For loop to iterate quickest. ' ' If the start value (constant, variable, expression) of the iteration ' range is greater than the end value (constant, variable, expression) ' then the loop is SKIPPED entirely. This behavior occurs when the ' Step value is POSITIVE. The reverse is true when the Step value ' is NEGATIVE. ' ' '
vba for loop
' For VBA//VB/Visual Basic only ' ================================================================ ' METHOD: FUNDAMENTAL 'EXAMPLE Dim iTotalPrints As Integer iTotalPrints = 5 For iCount = 1 To iTotalPrints MsgBox Prompt:=iCount, Title:="Method: Fundamental" Next 'SYNTAX ' For <your-variable-to-be-used> = <first-number> To <last-number> ' 'Code that uses <your-variable-to-be-used> ' Next ' ================================================================ ' METHOD: WITHIN AN ARRAY 'EXAMPLE Dim sTextList(4) As String 'Note: doesn't have to be of "String" data-type sTextList(0) = "aaa" sTextList(1) = "bbb" sTextList(2) = "ccc" sTextList(3) = "ddd" sTextList(4) = "eee" For Each sSeparateText In sTextList MsgBox Prompt:=sSeparateText, Title:="Method: Within an Array" Next 'SYNTAX ' For Each <your-variable-to-be-used> In <your-array-of-texts> ' 'Code that uses <your-variable-to-be-used> ' Next
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