以下为Java代码打印近似圆

package com.prc.exp;

public class PrintCircular {

    public static void main(String[] args) {
        int r = 15;// 半径
        print(r);

    }

    /** 打印圆 */
    public static void print(int r) {
        for (int rowNm = 0; rowNm <= r * 2; rowNm++) {
            // 计算当前行数与中轴线的距离
            long dits = Math.round(Math.sqrt(r * r - Math.pow((r - rowNm), 2)));
            // 打印每一行的内容
            printEveryLine(dits, r);
        }
    }

    /** 打印圆每一行的内容 */
    public static void printEveryLine(long dist, int r) {
        StringBuilder line = new StringBuilder();
        for (int i = 0; i <= 2 * r; i++) {
            if (i == r - dist || i == r + dist)// 每行需要打*的位置
                line.append("*");
            else
                line.append("  ");
        }
        System.out.println(line.toString());
    }
}