java实现杨辉三角

package com.ltl.test;

public class YangHui {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//1.声明并初始化二维数组
		int[][] yanghui=new int[10][];
		//2.给数组的元素赋值
		for (int i = 0; i < yanghui.length; i++) {
			yanghui[i]=new int[i+1];
			//2.1 给首末元素赋值
			yanghui[i][0]=1;
			yanghui[i][i]=1;
			//2.2给每行非首末元素赋值
			for (int j = 1; j < yanghui[i].length - 1; j++) {
				yanghui[i][j] = yanghui[i - 1][j - 1] + yanghui[i - 1][j];
			}
		}
		//3.遍历二维数组
		for (int i = 0; i < yanghui.length; i++) {
			for (int j = 0; j < yanghui[i].length; j++) {
				System.out.print(yanghui[i][j]+" ");
			}
			System.out.println();
		}

	}

}