用于循环载入多个文件，比如文本文件。不用手动输入t1.txt, t2.txt ,t3.txt... , 然后得到的文件可以用一个矩阵存储下来。或者用一个向量以流的方式存储。-This program is used to cycle load files, like text files. For example,you don t have to manually type t1.txt, t2.txt, t3.txt in your