在powershell中打印出近似圆形

版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。

本文链接： https://blog.csdn.net/dylan_lyd/article/details/79326057

import java.util.Scanner;
import java.lang.Math;

public class Circle
{
	public static void main(String[] args)
	{
		Scanner in = new Scanner(System.in);
		System.out.println("Please enter the radius(SHOULD BE INTEGER): ");
		int radius = in.nextInt();
		int loopNum = 2*radius+1;
		for(int i = 0; i < loopNum; i++)
		{
			// the horizontal distance between the places that would be pinned and the circle center
			int dis = (int)Math.sqrt(radius*radius-(radius-i)*(radius-i));
			// the horizontal positions that should be pinned
			int x1 = radius-dis;
			int x2 = radius+dis;
			//beautify the circle
			if((radius >= 3) && (i == radius-1 || i == radius || i == radius+1))
			{
				x1 = 0;
				x2 = 2*radius;
			}
			// if x1 == x2, then just print one star
			if(x1 == x2)
			{
				// in the cmd window the vertical distance seems to be
				// 2 times as the horizontal distance
				// so make the horizontal distance 2 times as origin
				for(int j = 0; j < x1*2-1; j++)
				{
					System.out.print(" ");
				}
				System.out.println("**");
			}
			else	// if x1 != x2, then print two symmetric stars
			{
				for(int j = 0; j < x2*2-1; j++)
				{
					if(j == x1*2){
						System.out.print("*");
					}
					else{
						System.out.print(" ");
					}
				}
				System.out.println("*");
			}
		}
	}
}

题目来自《疯狂java讲义（第四版）》 P106，第三题

实现的效果如下：

感觉和书上要求的还有些差距……