# frexp(3) [netbsd man page]

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

NAME
frexp -- 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);

DESCRIPTION
The frexp() function breaks a floating-point number into a normalized fraction and an integral power of 2.  It stores the integer in the int
object pointed to by exp.

RETURN VALUES
The frexp() function returns 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.

ldexp(3), math(3), modf(3)

STANDARDS
The frexp() function conforms to ANSI X3.159-1989 (``ANSI C89'').

BSD								  March 21, 2006							       BSD```

## Check Out this Related Man Page

```frexp(3M)						  Mathematical Library Functions						 frexp(3M)

NAME
frexp, frexpf, frexpl - extract mantissa and exponent from a floating-point number

SYNOPSIS
cc [ flag... ] file... -lm [ library... ]
#include <math.h>

double frexp(double num, int *exp);

float frexpf(float num, int *exp);

long double frexpl(long double num, int *exp);

DESCRIPTION
These functions break a floating-point number into a normalized fraction and an integral power of 2. They store the integer exponent in the
int object pointed to by exp.

RETURN VALUES
For finite arguments, these functions return the value x, such that x is a double with magnitude in the interval [1/2, 1)  or  0,  and  num
equals x times 2 raised to the power *exp.

If num is NaN, NaN is returned and the value of *exp is unspecified.

If num is +- 0, +- 0 is returned and the value of *exp is 0.

If num is +-Inf, num is returned and the value of *exp is unspecified.

ATTRIBUTES
See attributes(5) for descriptions of the following attributes:

+-----------------------------+-----------------------------+
|      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
+-----------------------------+-----------------------------+
|Interface Stability	     |Standard			   |
+-----------------------------+-----------------------------+
|MT-Level		     |MT-Safe			   |
+-----------------------------+-----------------------------+