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/* fabs.c
*
* Absolute value
*
*
*
* SYNOPSIS:
*
* double x, y;
*
* y = fabs( x );
*
*
*
* DESCRIPTION:
*
* Returns the absolute value of the argument.
*
*/
#include <math.h>
/* Avoid using UNK if possible. */
#ifdef UNK
#if BIGENDIAN
#define MIEEE 1
#else
#define IBMPC 1
#endif
#endif
double fabs(x)
double x;
{
union
{
double d;
short i[4];
} u;
u.d = x;
#ifdef IBMPC
u.i[3] &= 0x7fff;
#endif
#ifdef MIEEE
u.i[0] &= 0x7fff;
#endif
#ifdef DEC
u.i[3] &= 0x7fff;
#endif
#ifdef UNK
if( u.d < 0 )
u.d = -u.d;
#endif
return( u.d );
}
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