Why 6.84 - 3.6 == 3.2399999999999998

Question

I just encountered this and can\'t figure out why exactly Ruby behaves this way.

Could someone explain why in Ruby:

6.84 - 3.6 == 3.2399999999999998
         


        

Answer 1

Because double/float use base-2 notation and decimal base-10 notation.

Here's a useful link: http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html