comparing two doubles in the latest visual studio

Asked Sep 15 '16 at 06:05

Active Sep 15 '16 at 06:28

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In our product code we are substracting the two double variables value1 and value2 and the result is compared with EPSILON, its value is 10e-6.as shown below

return ( fabs(value1 - value2) <= EPSILON ) ? true : false;

Now this was working perfectly fine in windows 7(VS 2008). Recently we moved to windows 10(VS 2013) because of this its breaking.After my investigation on this I found out that in windows 10 operation on doubles leads to change in the precision value compared to earlier versions.

TO fix this issue I changed EPSILON to 10e-4. After doing this though this one got fixed but some other code is breaking where i am using EPSILON.

what can I do to fix this problem ? Any help would be much appreciated.

edited Sep 15 '16 at 06:28

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asked Sep 15 '16 at 06:05

ShrinivasD

3

You know, that line is the same as `return fabs(value1 - value2) <= EPSILON;` – Deduplicator Sep 15 '16 at 06:10
Yes it is, Thanks. – ShrinivasD Sep 15 '16 at 06:17
Did you try the strict IEEE fp compiler option or is that what fails? – doug Sep 15 '16 at 06:20
It works fine in VS2015. Show [Minimal, Complete, and Verifiable example](http://stackoverflow.com/help/mcve) – Barmak Shemirani Sep 15 '16 at 06:24
1

2013 is not the latest, VS2015 update 3 has been out for a while – nvoigt Sep 15 '16 at 06:26
1

I strongly doubt if it is really precision of double got changed. Any proof on it? – Adrian Shum Sep 15 '16 at 06:33

comparing two doubles in the latest visual studio

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