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Annotation of 40BSD/lib/libF77/z_div.c, revision 1.1.1.1

1.1       root        1: struct dcomplex { double dreal, dimag; };
                      2: 
                      3: z_div(c, a, b)
                      4: struct dcomplex *a, *b, *c;
                      5: {
                      6: double ratio, den;
                      7: double abr, abi;
                      8: 
                      9: if( (abr = b->dreal) < 0.)
                     10:        abr = - abr;
                     11: if( (abi = b->dimag) < 0.)
                     12:        abi = - abi;
                     13: if( abr <= abi )
                     14:        {
                     15:        if(abi == 0)
                     16:                abort(); /* fatal("complex division by zero"); */
                     17:        ratio = b->dreal / b->dimag ;
                     18:        den = b->dimag * (1 + ratio*ratio);
                     19:        c->dreal = (a->dreal*ratio + a->dimag) / den;
                     20:        c->dimag = (a->dimag*ratio - a->dreal) / den;
                     21:        }
                     22: 
                     23: else
                     24:        {
                     25:        ratio = b->dimag / b->dreal ;
                     26:        den = b->dreal * (1 + ratio*ratio);
                     27:        c->dreal = (a->dreal + a->dimag*ratio) / den;
                     28:        c->dimag = (a->dimag - a->dreal*ratio) / den;
                     29:        }
                     30: 
                     31: }

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