疯狂java讲义第四章第三题

import java.util.Scanner;

public class Exercise0403 {
    //坐标差值
    public static double CoordinateDifference=0.5;
    public static void main(String[] args) {
        Scanner scan=new Scanner(System.in);
        double r=scan.nextDouble();
        if(r>0) {
            for (var x = -r; x<= r; x+=3){
                var y=Math.sqrt(Math.pow(r,2)-Math.pow(x,2));
                //遍历每一个i找到与y相等的值
                for(var i=-r;i<=r;i++){
                    if((Math.abs(i-y)