`public class NewtonRaphson{`

public static void main(String[] args) {

System.out.printf("%.3f",sqrt(423749));

}

static double sqrt(int n){

double x = n;

double root;

while(true){

root = (x + n/x)/2;

if(Math.abs(root-x) < 1){

break;

}

x = root;

}

return root;

}

}