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Annotation of cci/usr/src/usr.lib/libF77/c_div.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  *     @(#)c_div.c     2.1
                      3:  */
                      4: 
                      5: #include "complex"
                      6: #include <stdio.h>
                      7: #include <errno.h>
                      8: 
                      9: c_div(c, a, b)
                     10: register complex *a, *b, *c;
                     11: {
                     12: double ratio, den;
                     13: double abr, abi;
                     14: 
                     15: if( (abr = b->real) < 0.)
                     16:        abr = - abr;
                     17: if( (abi = b->imag) < 0.)
                     18:        abi = - abi;
                     19: if( abr <= abi )
                     20:        {
                     21:        if(abi == 0) {
                     22:                fprintf(stderr,"complex division by zero\n");
                     23:                /* f77_abort(EDOM); */
                     24:        }
                     25:        ratio = b->real / b->imag ;
                     26:        den = b->imag * (1 + ratio*ratio);
                     27:        c->real = (a->real*ratio + a->imag) / den;
                     28:        c->imag = (a->imag*ratio - a->real) / den;
                     29:        }
                     30: 
                     31: else
                     32:        {
                     33:        ratio = b->imag / b->real ;
                     34:        den = b->real * (1 + ratio*ratio);
                     35:        c->real = (a->real + a->imag*ratio) / den;
                     36:        c->imag = (a->imag - a->real*ratio) / den;
                     37:        }
                     38: 
                     39: }

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