frexp(3) BSD Library Functions Manual frexp(3)
NAME
frexp -- break floating-point number into normalized fraction and power
of 2
SYNOPSIS
#include <math.h>
double
frexp(double value, int *exp);
long double
frexpl(long double value, int *exp);
float
frexpf(float value, int *exp);
DESCRIPTION
The frexp() functions break the floating-point number value into a nor-
malized fraction and an integral power of 2. They store the integer in
the int object pointed to by exp.
The functions return a number x such that x has a magnitude in the inter-
val [1/2, 1) or 0, and value = x*(2**exp).
SPECIAL VALUES
frexp(+-0, exp) returns +-0, and stores 0 in the object pointed to by
exp.
frexp(+-infinity, exp) returns +-infinity, and stores an unspecified
value in the object pointed to by exp.
frexp(Nan, exp) returns a Nan, and stores an unspecified value in the
object pointed to by exp.
SEE ALSO
math(3), scalbn
STANDARDS
The frexp() functions conform to ISO/IEC 9899:2011.
BSD December 11, 2006 BSD
Mac OS X 10.9.1 - Generated Wed Jan 8 06:18:15 CST 2014