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Annotation of 42BSD/usr.lib/libm/hypot.c, revision 1.1

1.1     ! root        1: /*     @(#)hypot.c     4.1     12/25/82        */
        !             2: 
        !             3: /*
        !             4:  * sqrt(a^2 + b^2)
        !             5:  *     (but carefully)
        !             6:  */
        !             7: 
        !             8: double sqrt();
        !             9: double
        !            10: hypot(a,b)
        !            11: double a,b;
        !            12: {
        !            13:        double t;
        !            14:        if(a<0) a = -a;
        !            15:        if(b<0) b = -b;
        !            16:        if(a > b) {
        !            17:                t = a;
        !            18:                a = b;
        !            19:                b = t;
        !            20:        }
        !            21:        if(b==0) return(0.);
        !            22:        a /= b;
        !            23:        /*
        !            24:         * pathological overflow possible
        !            25:         * in the next line.
        !            26:         */
        !            27:        return(b*sqrt(1. + a*a));
        !            28: }
        !            29: 
        !            30: struct complex
        !            31: {
        !            32:        double  r;
        !            33:        double  i;
        !            34: };
        !            35: 
        !            36: double
        !            37: cabs(arg)
        !            38: struct complex arg;
        !            39: {
        !            40:        double hypot();
        !            41: 
        !            42:        return(hypot(arg.r, arg.i));
        !            43: }

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