4.3BSD - /usr/man/cat3/modf.0

FREXP(3)                                                              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∗2n
       indirectly through eptr.

       Ldexp returns the quantity value���2exp.

       Modf returns the positive fractional part of value and stores the inte‐
       ger part indirectly through iptr.


7th Edition                      May 15, 1985                         FREXP(3)