在控制台上近似输出圆

package zuoye;

//2017.03.17 by小方
public class X0317 {

    public static void main(String[] args) {
        int r=10;
        for (int y=0;y<=2*r;y=y+2)
        {
            long x=Math.round(r+Math.sqrt(2*r*y-y*y));
            for (int i=0;i<=2*r;i++ )
            {
                if (i==x||i==2*r-x)
                {
                    System.out.print("*");
                }
                else
                {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }

    }

}