freebsd-src/lib/libF77/c_div.c
L Jonas Olsson 09c656ca68 Library for f2c (part 2 of 2)
Obtained from: netlib.att.com
1994-10-26 18:17:41 +00:00

37 lines
665 B
C

#include "f2c.h"
#ifdef KR_headers
extern VOID sig_die();
VOID c_div(c, a, b)
complex *a, *b, *c;
#else
extern void sig_die(char*,int);
void c_div(complex *c, complex *a, complex *b)
#endif
{
double ratio, den;
double abr, abi;
if( (abr = b->r) < 0.)
abr = - abr;
if( (abi = b->i) < 0.)
abi = - abi;
if( abr <= abi )
{
if(abi == 0)
sig_die("complex division by zero", 1);
ratio = (double)b->r / b->i ;
den = b->i * (1 + ratio*ratio);
c->r = (a->r*ratio + a->i) / den;
c->i = (a->i*ratio - a->r) / den;
}
else
{
ratio = (double)b->i / b->r ;
den = b->r * (1 + ratio*ratio);
c->r = (a->r + a->i*ratio) / den;
c->i = (a->i - a->r*ratio) / den;
}
}