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Asked: 2026-06-01T14:23:00+00:00

When i am checking values inside scala interpreter like: scala> 1==1.0000000000000001 res1: Boolean =

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When i am checking values inside scala interpreter like:

scala> 1==1.0000000000000001

res1: Boolean = true

scala> 1==1.000000000000001

res2: Boolean = false

Here I am not getting clear view related with “how does scala compiler interpret these as integer or floating points or doubles(and comparing)” .

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1 Answer

  1. Editorial Team

    It is not really Scala related, it is more of a ieee-754 floating-point arithmetic issue. First of all when comparing Int with Double it will cast Int to Double (always safe). The second case is obvious – values are different.

    What happens with the first case is that Double type is not capable of storing that many significant digits (17 in your case, 64-bit floating point can store up-to 16 decimal digits) so it rounds the value to 1. And 1 == 1.

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