Understanding Intrinsic 'Fraction' Function in Fortran

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The intrinsic 'fraction' function in Fortran is designed to return the fractional part of a real number, but its output can be misleading if not understood correctly. The confusion arises from the fact that the function does not simply return the decimal fraction of a number. Instead, it computes the fractional part based on the underlying representation of the number in floating-point format. For instance, when inputting 10.0, the output of 0.625 reflects the fractional part when 10 is expressed in a different base, specifically base 24, as shown in the equation 10 = 0.625 * 24. Understanding the function's behavior in relation to floating-point representation is crucial for accurate usage.
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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