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(freebsd section 3)
man page for frexp

FREXP(3)						   BSD Library Functions Manual 						  FREXP(3)

frexp, frexpf, frexpl -- convert floating-point number to fractional and integral components LIBRARY
Math Library (libm, -lm) SYNOPSIS
#include <math.h> double frexp(double value, int *exp); float frexpf(float value, int *exp); long double frexpl(long double value, int *exp); DESCRIPTION
The frexp(), frexpf() and frexpl() functions break a floating-point number into a normalized fraction and an integral power of 2. They store the integer in the int object pointed to by exp. RETURN VALUES
These functions return the value x, such that x is a double with magnitude in the interval [1/2, 1) or zero, and value equals x times 2 raised to the power *exp. If value is zero, both parts of the result are zero. SEE ALSO
ldexp(3), math(3), modf(3) STANDARDS
The frexp(), frexpf(), and frexpl() functions conform to ISO/IEC 9899:1999 (``ISO C99''). BSD
March 4, 2005 BSD

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