动态输出杨辉三角

package javacore;

import java.util.Scanner;

/**
 * @author lixw
 * @date created in 14:03 2018/12/17
 */
public class YanghuiTriangle {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("请输入需要输出的杨辉三角的行数：");
        int rows = in.nextInt();

        for (int i = 0; i < rows; i++) {
            int number = 1;
            //打印空格字符串
            System.out.format("%" + (rows - i) * 2 + "s", "");
            for (int j = 0; j <= i; j++) {
                System.out.format("%4d", number);
                number = number * (i - j) / (j + 1);
            }
            System.out.println();
        }
    }
}