// -*- mode: java;  -*-
// Newtons approximation to the square root
val _test_sqrt = { flt x ->
    flt epsilon = 1e-15;
    flt guess = x;
    while( 1 ) {
        flt next = (x/guess + guess)/2;
        if( guess-epsilon <= next & next <= guess+epsilon ) return guess;
        //if( guess==next ) return guess;
        guess = next;
    }
};
flt farg = arg; return _test_sqrt(farg) + _test_sqrt(farg+2.0);