Question

I know this will seem like a really stupid question, but I just don’t get why this isn’t working. This:

 System.out.println(5 % .10);

And it’s returning:

0.09999999999999973

I really have NO IDEA. I’m just learning Java, and I’m pretty good with C#, so I tried with C# to. C# seemed to return the same thing also.

Answer 1

As others explained, this is due to inaccuracies caused by floating point precision.

You should use BigDecimal, in this case the remainder method for precise arithmetic involving decimals.

BigDecimal number = new BigDecimal(5);
BigDecimal divisor = new BigDecimal("0.1");
BigDecimal result = number.remainder(divisor);
System.out.println(result); // 0