lib/libF77/c_div.c


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#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;
	}
}