Excel VBA - Append string with "0"'s

Im trying to make a function to append a number with 0's, which I know cant work as an interger seeing as 00000 will recognize as 0, so trying to put it as a string.

I have two problems with my code:-
    Dim endRule As String
    endRule = Int("0")
    While Len(Str(startRule)) < 7
        startRule = Str(startRule & "0")

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1 - On first run startRule becomes " 0" (space at the front of the string).
2 - the "0" is never appended to the string, it always is " 0" (which the unknown space from issue #1).

My code runs great if it starts with a number apart from 0.

Does anyone have any suggestions?

Thank you
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Why use a custom function, use the built-in Format() function.
Format("0", "0000000")

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in your example you define endRule but not StartRule

myString = "1"
myNewString =Left(myString & "0000000";7)


myInt = 1
myNewString =Left(Format(myInt, "0") & "0000000";7)


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tonelm54Author Commented:
Good afternoon,
MacroShadow: Using the format fills the wrong way, for example if run for the number 1, it becomes "0000001" instead of "1000000", I could use StrReverse, so for example:-
startRule = StrReverse(Format(startRule, "0000000"))

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Which seems to work ok, but seems a bit of a hack :-S, but Ill go with it.

Rgonzo1971: Works as well, thank you

if you number is bigger than 9 with your hacked code you will get a wrong answer

with 12 you get

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