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Math 101 anyone?by smcone (Acolyte) |
on Oct 12, 2004 at 07:38 UTC ( [id://398401]=perlquestion: print w/replies, xml ) | Need Help?? |
smcone has asked for the wisdom of the Perl Monks concerning the following question:
Hello Perl Monks -
I am a new user to this site - but a professional programmer for many years - hope I can be a vital contributor to your esteemed collection of knowledge. I have a simple math question. I recently stumbled upon a very obscure problem in one of my apps. According to Perl, 100.10 - 100.00 = 0.0999999999999943 and not ".10" as I would have imagined from my early school days. Try it yourself in your favorite shell (this happens in v5.83): perl -e "print (100.10-100);" Can someone with supreme wisdom please explain to me why perl comes to this result from simple math with a non-whole number. This is causing thousands of calculations in my app to be off by .01 - .02 - but when money is involved it needs to be 100% correct. Is this a perl bug? Or am I missing something completely obvious? Look forward to your replies.
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