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vba for next loop

By Excel HeroExcel Hero on Oct 10, 2020
For i = 1 to 100
    'Code here is executed 100 times.

'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

'       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

'      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.

'      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.
'      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.

'     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 is accurate when the
'     Step value is POSITIVE. The reverse is true when the Step value
'     is NEGATIVE.

Source: academy.excelhero.com

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vba for next

By VasteMondeVasteMonde on Jan 22, 2021
Dim Words, Chars, MyString 
For Words = 10 To 1 Step -1 ' Set up 10 repetitions. 
 For Chars = 0 To 9 ' Set up 10 repetitions. 
 MyString = MyString & Chars ' Append number to string. 
 Next Chars ' Increment counter 
 MyString = MyString & " " ' Append a space. 
Next Words 

Source: docs.microsoft.com

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