Understanding Intrinsic 'Fraction' Function in Fortran

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PaulDirac
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I have tried to use the intrinsic' fraction' function in Fortran but have failed to understand how it works. I thought that it would return the fractional part of a real number, but when I ran a few numbers through it, I got something that was a far cry from what I expected. For example, I tried fraction(10.0) and got 0.625. Can you tell me what's wrong?
 

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