一个模拟演示病毒自感染文件与实现自我复制自我启动的过程，当然只是模拟演示不会对系统产生损伤-A simulated demonstration of the virus from infected files and to achieve self-replication self-initiated process, of course, only simulated demonstration of the system will not produce injury

哈夫曼树编码译码，从文件中读取字符串，以二进制形式存在其他文件里。-Huffman coding and decoding, reading a string from a file to another file in binary form.