41 lines
987 B
C
41 lines
987 B
C
/****************************************************************************
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* lib/math/lib_round.c
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*
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* This file is a part of NuttX:
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* (C) 2012 Petteri Aimonen <jpa@nx.mail.kapsi.fi>
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <math.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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#ifdef CONFIG_HAVE_DOUBLE
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double round(double x)
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{
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double f = modf(x, &x);
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if (x <= 0.0 && f <= -0.5)
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{
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x -= 1.0;
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}
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if (x >= 0.0 && f >= 0.5)
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{
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x += 1.0;
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}
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return x;
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}
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#endif
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