ios - Difference between two identical NSTimeInterval is different than zero -

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edit:

this not strictly floating point question nstimeinterval derived double. added floating point tags related.

problem:

when computing difference between 2 identical nstimeinterval value different zero (-0.0000013etc..).

question:

why that? understanding double values behaviour should consistent (if float type different).

swift code:

let timedifference : nstimeinterval = timevalue.timeintervalsince1970 - timestarted!.timeintervalsince1970


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