src/common/frexp.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
#include "copyright.h"

frexp(x, ip)            /* call it paranoia, I've seen the lib version */
register double  x;
int  *ip;
{
        int  neg;
        register int  i;

        if (neg = (x < 0.0))
                x = -x;
        else if (x == 0.0) {
                *ip = 0;
                return(0.0);
        }
        if (x < 0.5)
                for (i = 0; x < 0.5; i--)
                        x *= 2.0;
        else
                for (i = 0; x >= 1.0; i++)
                        x /= 2.0;
        *ip = i;
        if (neg)
                return(-x);
        else
                return(x);
}
Revision:	1.3
Committed:	Tue Feb 25 02:47:21 2003 UTC (21 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R5
Changes since 1.2:	+1 -56 lines
Log Message:	Replaced inline copyright notice with #include "copyright.h"
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	1.2	static const char RCSid[] = "$Id$";
3	greg	1.1	#endif
4	greg	1.3	#include "copyright.h"
5	greg	1.1
6			frexp(x, ip) /* call it paranoia, I've seen the lib version */
7			register double x;
8			int *ip;
9			{
10			int neg;
11			register int i;
12
13			if (neg = (x < 0.0))
14			x = -x;
15			else if (x == 0.0) {
16			*ip = 0;
17			return(0.0);
18			}
19			if (x < 0.5)
20			for (i = 0; x < 0.5; i--)
21			x *= 2.0;
22			else
23			for (i = 0; x >= 1.0; i++)
24			x /= 2.0;
25			*ip = i;
26			if (neg)
27			return(-x);
28			else
29			return(x);
30			}