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_type *a, *b, *c;
7 #else
8 extern void sig_die(char*,int);
9 void c_div(complex_type *c, complex_type *a, complex_type *b)
10 #endif
11 {
12 double ratio, den;
13 double abr, abi, cr;
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 cr = (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 cr = (a->r + a->i*ratio) / den;
34 c->i = (a->i - a->r*ratio) / den;
35 }
36 c->r = cr;
37 }
38