| FREXP(3) | Library Functions Manual | FREXP(3) |
frexp — break
floating-point number into normalized fraction and power of 2
#include
<math.h>
double
frexp(double
value, int
*exp);
long double
frexpl(long
double value, int
*exp);
float
frexpf(float
value, int
*exp);
The
frexp()
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).
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.
The frexp() functions conform to ISO/IEC
9899:2011.
| December 11, 2006 | macOS 15.0 |