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Annotation of researchv10no/libF77/c_div.c, revision 1.1.1.1

1.1       root        1: #include "f2c.h"
                      2: 
                      3: #ifdef KR_headers
                      4: extern VOID sig_die();
                      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: }

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