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*                            Open Watcom Project
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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#include "variety.h"
#include "cplx.h"
#include "pdiv.h"

_WMRTLINK dcomplex _IF_C16Div( double a, double b, double c, double d ) {
//======================================================================

// Divide two double precision complex numbers and return the
// imaginary part of the result.
// ( a, b )/( c, d ) = (( a, b )/( d + c*c/d )) * ( c/d, -1 )

    double      quo;
    double      tmp;
    dcomplex    res;

    if( fabs( d ) < fabs( c ) ) {
        tmp = a;        // convert to (-b,a)/(-d,c)
        a = - b;
        b = tmp;
        tmp = c;
        c = -d;
        d = tmp;
    }
    quo = PDIV( c , d );
    tmp = quo * c + d;
    a = PDIV( a, tmp );
    b = PDIV( b, tmp );
    c = quo;
    res.realpart = a * c + b;
    res.imagpart = b * c - a;
    return( res );
}
