5306523bce
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5415 42af7a65-404d-4744-a932-0658087f49c3
41 lines
965 B
C
41 lines
965 B
C
/************************************************************************
|
|
* lib/math/lib_round.c
|
|
*
|
|
* This file is a part of NuttX:
|
|
*
|
|
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
|
|
* (C) 2012 Petteri Aimonen <jpa@nx.mail.kapsi.fi>
|
|
*
|
|
************************************************************************/
|
|
|
|
/************************************************************************
|
|
* Included Files
|
|
************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#include <nuttx/compiler.h>
|
|
|
|
#include <math.h>
|
|
|
|
/************************************************************************
|
|
* Public Functions
|
|
************************************************************************/
|
|
|
|
#ifdef CONFIG_HAVE_DOUBLE
|
|
double round(double x)
|
|
{
|
|
double f = modf(x, &x);
|
|
if (x <= 0.0 && f <= -0.5)
|
|
{
|
|
x -= 1.0;
|
|
}
|
|
|
|
if (x >= 0.0 && f >= 0.5)
|
|
{
|
|
x += 1.0;
|
|
}
|
|
|
|
return x;
|
|
}
|
|
#endif
|