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Unix Version 7 - man page for frexp (v7 section 3)

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FREXP(3)										 FREXP(3)

       frexp, ldexp, modf - split into mantissa and exponent

       double frexp(value, eptr)
       double value;
       int *eptr;

       double ldexp(value, exp)
       double value;

       double modf(value, iptr)
       double value, *iptr;

       Frexp  returns  the  mantissa of a double value as a double quantity, x, of magnitude less
       than 1 and stores an integer n such that value = x*2**n indirectly through eptr.

       Ldexp returns the quantity value*2**exp.

       Modf returns the positive fractional part of value and stores the integer part  indirectly
       through iptr.

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