From: chris@...
Date: 2021-02-15T13:38:41+00:00
Subject: [ruby-core:102503] [Ruby master Bug#17630] '+' doesn't work correctly for some floats (x.07 + y.4 will give z.46999999999997 instead of z.47)

Issue #17630 has been updated by chrisseaton (Chris Seaton).


Did you read this?

https://bugs.ruby-lang.org/#Floating-point-numbers

----------------------------------------
Bug #17630: '+' doesn't work correctly for some floats (x.07 + y.4 will give z.46999999999997 instead of z.47)
https://bugs.ruby-lang.org/issues/17630#change-90397

* Author: zGalili (Ziv Galili)
* Status: Open
* Priority: Normal
* ruby -v: 2.7.2p137
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
1.02 + 1.4 will give 2.42 as expected

but not for all cases.

examples for wrong answers:
``` ruby
1.07 + 1.4
-> 2.4699999999999998
255.07 + 5.4
-> 260.46999999999997
480.07 + 5.4
-> 485.46999999999997
```

other numbers works correctly:
``` ruby
255.06 + 5.5
-> 260.56
2.07 + 222222.4
-> 222224.47
```

seems like the problem is with x.07 + y.4 but only for some results.




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