Java实现杨辉三角

杨辉三角的模型

 分析：

1、最外层的数字始终是 1

2.每个数等于它上方两数之和。

public class Yanghui {
        public static void main(String[] args) {
            int[][] yanghui=new int[10][];
            for (int i = 0; i < yanghui.length; i++) {
                yanghui[i]=new int[i+1];
                for (int j = 0; j < yanghui[i].length; j++) {
                    if(j==0||i==j){
                        yanghui[i][j]=1;
                    }else{
                        yanghui[i][j]=yanghui[i-1][j-1]+yanghui[i-1][j];
                    }
                }
            }
            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();
            }
        }
}