Arithmetic in ruby

Question

Why this code 7.30 - 7.20 in ruby returns 0.0999999999999996, not 0.10?

But if i\'ll write 7.30 - 7.16, for examp

Answer 1

Since you are doing floating point math then the number returned is what your computer uses for precision.

If you want a closer answer, to a set precision, just multiple the float by that (such as by 100), convert it to an int, do the math, then divide.

There are other solutions, but I find this to be the simplest since rounding always seems a bit iffy to me.

This has been asked before here, you may want to look for some of the answers given before, such as this one: Dealing with accuracy problems in floating-point numbers