exp() precision between Mac OS and Windows

Question

I got a code here, and when I run them on Win and Mac OS, the precision of the results is different, anyone can help?

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Answer 1

How Can I get the same result.

Unless the math library on OS X uses the very same implementation/algorithm for calculating e ^ x, you won't and can't really get exactly the same results. Floating-point calculations aren't exact, deal with it.