# frexp

Extract mantissa and exponent.

 ``` floatn frexp (``` float`n`  x, __global int`n`  *exp`)`
 ``` floatn frexp (``` float`n`  x, __local int`n`  *exp`)`
 ``` floatn frexp (``` float`n`  x, __private int`n`  *exp`)`
 ``` float frexp (``` float  x, __global int  *exp`)`
 ``` float frexp (``` float  x, __local int  *exp`)`
 ``` float frexp (``` float  x, __private int  *exp`)`
 ``` doublen frexp (``` double`n`  x, __global int`n`  *exp`)`
 ``` doublen frexp (``` double`n`  x, __local int`n`  *exp`)`
 ``` doublen frexp (``` double`n`  x, __private int`n`  *exp`)`
 ``` double frexp (``` double  x, __global int  *exp`)`
 ``` double frexp (``` double  x, __local int  *exp`)`
 ``` double frexp (``` double  x, __private int  *exp`)`
 ``` halfn frexp (``` half`n`  x, __global int`n`  *exp`)`
 ``` halfn frexp (``` half`n`  x, __local int`n`  *exp`)`
 ``` halfn frexp (``` half`n`  x, __private int`n`  *exp`)`
 ``` half frexp (``` half  x, __global int  *exp`)`
 ``` half frexp (``` half  x, __local int  *exp`)`
 ``` half frexp (``` half  x, __private int  *exp`)`

## Description

Extract mantissa and exponent from `x`. For each component the mantissa returned is a float with magnitude in the interval [1/2, 1) or 0. Each component of `x` equals mantissa returned * 2exp.

## Notes

The built-in math functions are not affected by the prevailing rounding mode in the calling environment, and always return the same value as they would if called with the round to nearest even rounding mode.

An application that wants to use half and half`n` types will need to include the ```#pragma OPENCL EXTENSION cl_khr_fp16 : enable``` directive.

## Also see

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