Re: Math::round not rounding correctly (simple)


Do you know where your variables are?
	PerlMonks

by tye (Sage)

on Dec 23, 2014 at 20:01 UTC ( [id://1111221]=note: print w/replies, xml )

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When the number is actually 3461.49999999999999382 it should be rounded to 3461 but might be displayed as simply "3461.5".

Edit 1 in response to at least the second "edit" labeled "Edit 2" above (for sanity's sake, please stop changing the root of this conversation):

perl -e 'print sprintf("%.20f",(3010*1.15))."\n"' # Outputs 3461.49999
+999999950000000
[download]

QED. (Now, maybe you'll go read and try to understand the stuff about floating point that was linked to quite a while ago?)

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Re^2: Math::round not rounding correctly (simple) by bulrush (Scribe) on Dec 23, 2014 at 20:17 UTC
You got 3461.49999999999950000000? Because I didn't. What's your OS name and version? What's your perl version? Perhaps we have a difference of some math library or something.	[reply]
Re^3: Math::round not rounding correctly (edit) by tye (Sage) on Dec 23, 2014 at 20:33 UTC
You got 3461.49999999999950000000? Because I didn't. What's your OS name and version? What's your perl version? Perhaps we have a difference of some math library or something. (Prior node quoted in entirety due to rash of prior "edit"s.) So I edited my prior node to correct my mis-paste. Clearly "%.4f" would not yield that many trailing digits. To get 20 trailing digits, I clearly had used "%.20f" (which is what my node now shows). (I also replied as edits are not so easy to notice, naturally.) Please try again. - tye	[reply]

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