1 #include "f2c.h"
2
3 #ifdef KR_headers
4 extern VOID sig_die();
c_div(c,a,b)5 VOID c_div(c, a, b)
6 complex *a, *b, *c;
7 #else
8 extern void sig_die(char*, int);
9 void c_div(complex *c, complex *a, complex *b)
10 #endif
11 {
12 double ratio, den;
13 double abr, abi;
14
15 if((abr = b->r) < 0.)
16 abr = - abr;
17 if((abi = b->i) < 0.)
18 abi = - abi;
19 if(abr <= abi)
20 {
21 if(abi == 0)
22 sig_die("complex division by zero", 1);
23 ratio = (double)b->r / b->i ;
24 den = b->i * (1 + ratio * ratio);
25 c->r = (a->r * ratio + a->i) / den;
26 c->i = (a->i * ratio - a->r) / den;
27 }
28
29 else
30 {
31 ratio = (double)b->i / b->r ;
32 den = b->r * (1 + ratio * ratio);
33 c->r = (a->r + a->i * ratio) / den;
34 c->i = (a->i - a->r * ratio) / den;
35 }
36 }
37