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Annotation of 42BSD/usr.lib/libF77/z_div.c, revision 1.1

1.1     ! root        1: /*
        !             2:  *     "@(#)z_div.c    1.1"
        !             3:  */
        !             4: 
        !             5: #include "complex"
        !             6: 
        !             7: z_div(c, a, b)
        !             8: dcomplex *a, *b, *c;
        !             9: {
        !            10: double ratio, den;
        !            11: double abr, abi;
        !            12: 
        !            13: if( (abr = b->dreal) < 0.)
        !            14:        abr = - abr;
        !            15: if( (abi = b->dimag) < 0.)
        !            16:        abi = - abi;
        !            17: if( abr <= abi )
        !            18:        {
        !            19:        if(abi == 0)
        !            20:                abort(); /* fatal("complex division by zero"); */
        !            21:        ratio = b->dreal / b->dimag ;
        !            22:        den = b->dimag * (1 + ratio*ratio);
        !            23:        c->dreal = (a->dreal*ratio + a->dimag) / den;
        !            24:        c->dimag = (a->dimag*ratio - a->dreal) / den;
        !            25:        }
        !            26: 
        !            27: else
        !            28:        {
        !            29:        ratio = b->dimag / b->dreal ;
        !            30:        den = b->dreal * (1 + ratio*ratio);
        !            31:        c->dreal = (a->dreal + a->dimag*ratio) / den;
        !            32:        c->dimag = (a->dimag - a->dreal*ratio) / den;
        !            33:        }
        !            34: 
        !            35: }

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