37 lines
665 B
C
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;
|
|
}
|
|
}
|