有一个数值是54321,我想让它分开写入一些文本文件中现有的文本有 
5000.txt
4000.txt
3000.txt
2000.txt
1000.txt
900.txt
800.txt
700.txt
600.txt
500.txt
400.txt
300.txt
200.txt
100.txt
90.txt
80.txt
70.txt
.
.
.
10.txt
9.txt
8.txt
.
.
.
1.txt是不是通过求余数这样?