Java数组练习(打印杨辉数组)

打印杨辉数组

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package com.kangkang.array;

import java.util.Scanner;

public class demo02 {
    public static void main(String[] args) {
        //杨辉三角
        // 让用户控制行数
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入行数");
        int n = scanner.nextInt();
        int[][] arr = new int[n][n];
        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j <= i; j++) {
                //让每一行的开头和结尾变成0
                if (j == 0 || j == i) {
                    arr[i][j] = 1;
                }else {
                    //1中间的数等于上面一行两个相邻的数相加的和
                    arr[i][j] = arr[i-1][j-1] + arr[i-1][j];
                }
                System.out.print(arr[i][j]+"\t");
            }
            System.out.println();
        }
    }
}

结果如下