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73 lines
2.7 KiB
C
73 lines
2.7 KiB
C
/*******************************************************************************
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* *
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* Trick Simulation Environment Software *
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* *
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* Copyright (c) 1996,1997 LinCom Corporation, Houston, TX *
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* All rights reserved. *
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* *
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* Copyrighted by LinCom Corporation and proprietary to it. Any unauthorized *
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* use of Trick Software including source code, object code or executables is *
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* strictly prohibited and LinCom assumes no liability for such actions or *
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* results thereof. *
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* *
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* Trick Software has been developed under NASA Government Contracts and *
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* access to it may be granted for Government work by the following contact: *
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* *
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* Contact: Charles Gott, Branch Chief *
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* Simulation and Graphics Branch *
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* Automation, Robotics, & Simulation Division *
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* NASA, Johnson Space Center, Houston, TX *
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* *
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*******************************************************************************/
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/*
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PURPOSE:
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(floating point number round off macro.)
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REFERENCE:
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((None))
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ASSUMPTIONS AND LIMITATIONS:
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()
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PROGRAMMERS:
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(((Robert W. Bailey) (LinCom Corp) (4/92) (--) (Realtime)))
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*/
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/*
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* $Id: roundoff.h 646 2010-04-28 21:50:31Z lin $
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*/
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#ifndef _ROUNDOFF_H_
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#define _ROUNDOFF_H_
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#define TRICK_ROUNDOFF_MAX 1.e15
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#define ROUNDOFF(nval,res,val)\
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{\
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double fraction , real , sval , my_remainder ;\
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if( val < (TRICK_ROUNDOFF_MAX*res) ) { \
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real = (double)((long)val) ;\
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fraction = val - real ;\
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sval = fraction / res ;\
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my_remainder = sval - (double)((long)sval) ;\
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if ( val > 0 ) {\
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if( my_remainder <= 0.5 ) {\
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nval = real + (double)((long)sval)*res ;\
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}\
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else {\
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nval = real + (double)((long)sval+1)*res ;\
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}\
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}\
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else {\
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if( my_remainder >= -0.5 ) {\
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nval = real + (double)((long)sval)*res ;\
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}\
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else {\
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nval = real + (double)((long)sval-1)*res ;\
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}\
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}\
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}\
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else { \
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nval = val;\
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}\
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}
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#endif
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