Issue with precision of Ruby math operations

Question

Do you know how to fix the following issue with math precision?

p RUBY_VERSION # => \"1.9.1\"
p 0.1%1 # => 0.1
p 1.1%1 # => 0.1
p 90.0%1 # => 0.0
p 9         


        

Answer 1

This is true of all computer languages, not just Ruby. It's a feature of representing floating point numbers on binary computers:

What Every Computer Scientist Should Know About Floating Point Arithmetic