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I want to store currency in a variable and do various math functions on it. As you probably know, using float variables are inprecise and therefore, other languages have introduced decimal types. What is the alternative in Autohotkey. I could of course simply remove the comma, do the math and reintroduce the comma after the calculation, but there must be another way.

If your currency amounts contain commas, they won't be recognized as numbers by AHK. You'll need to remove the commas (StringReplace), then use ordinary floating point operations on the resulting number. Afterwards, you can reintroduce formatting. (also see SetFormat)

So, I don't know of anything special in AHK for dealing with currency.

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The problem is that floating point operations are inaccurate. I believe the following page explains why:
http://effbot.org/pyfaq/why-are-floatin ... curate.htm

Have a look at this arbitrary precision library. long integer arithmetic library . you will still have to deal with any punctuation.

Excellent, shabj. It seems to solve my problem. Hope these posts make it easier for others to find.

I had a look at the arbitrary precision library, though I cannot see that it helps in any way, if I still have to convert from the string with decimals to a float.

In AHK, variable contents are strings (the official explanation is in the documentation) in most cases. You don't actually 'convert' a string of numbers into a different variable type, AHK attempts to use the string as though it were a number when it is used in a math expression.

This means that you'll have no trouble with code like the following:

And you really should look at the SetFormat docs page, as it explicitly details AHK's math limits and features.

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