Question

用java循环语句输出1,3,6,10,15换行再输出2,5,9,14换行再输出4,8,13换行输出7,12换行输出11

Answer 1

package com.test;
public class Test
{
public static void main(String[] args)
{
final int[] is = new int[] { 1, 3, 6, 10, 15, 2, 5, 9, 14, 4, 8, 13, 7, 12, 11 };
int index = 0;
for (int i = 5; i > 0; i--)
{
for (int j = 0; j < i; j++)
{
System.out.print(is[index] + "\t");
index++;
}
System.out.println();
}
}
}

追问

谢谢 请问如果不用数组行不行 数字间规律为n*(n+1)/2,n为每行第n个数