public class Ejecutador {

    public static void main(String[] args) {
        DrawMeACircle(3, 3, 3, "*"); // should print to the screen an ellipse looking circle
    }

    public static void DrawMeACircle(double posX, double posY, double radius, String patron) {

        double xaxis = 20;  // escanear coordenadas
        double yaxis = 20;  // " "

        for (double x = 0; x < xaxis; x++) {
            for (double y = 0; y < yaxis; y++) {

                // obtencion de coordenadas
                double a = Math.abs((posX - x) * (posX - x));
                double b = Math.abs((posY - y) * (posY - y));

                double c = Math.abs(a + b);
                double d = Math.abs(radius * radius);

                double arbitraryNumber = 2;
                if (Math.abs(c - d) < arbitraryNumber) {

                  System.out.print(patron);
                }
                else {
                    System.out.print(' ');
                }
            }
            System.out.println();
        }
    }

}