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);
float
frexpf(float value, int *exp);
DESCRIPTION
The frexp() and frexpf() functions break the floating-point number value into a normalized 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 interval [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() and frexpf() functions conform to ISO/IEC 9899:1999(E).
BSD
January 30, 2003 BSD
