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

FREXP(3)				       Library Functions Manual 				     FREXP(3)

NAME
frexp, ldexp, modf - split into mantissa and exponent
SYNOPSIS
double frexp(value, eptr) double value; int *eptr; double ldexp(value, exp) double value; double modf(value, iptr) double value, *iptr;
DESCRIPTION
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. FREXP(3)


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