Java杨辉三角菱形(java杨辉三角代码)

package homework10;
import java.util.Scanner;
public class YangHui {
    public static void main(String[] args) {
        //定义二维数组并初始化
        System.out.println("请输入行数:");
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        int [][]arr=new int[n][];
        //给元素赋值
        for(int i =0;i< arr.length;i++){
            arr [i] =new int[i+1];//第0行有1个元素，第1行有2个元素
            arr[i][0]=arr[i][i]=1;//首末元素为1
            for(int j=1;j