ruby: converting from float to integer in ruby produces strange results

Question

ree-1.8.7-2010.02 :003 > (10015.8*100.0).to_i
 => 1001579 
ree-1.8.7-2010.02 :004 > 10015.8*100.0
 => 1001580.0 
ree-1.8.7-2010.02 :005 > 1001580.0.to         


        

Answer 1

http://en.wikipedia.org/wiki/Floating_point#Accuracy_problems

>> sprintf("%.16f", 10015.8*100.0)
=> "1001579.9999999999000000"

And Float#to_i truncates this to 1001579.