一个用于测试计算机串口通信的小例程，可以实现串口字符发送的测试和统计-One used to test a small computer serial port communication routines can be achieved to send serial characters in the test and statistics

对一篇英文文献中的字符频率进行统计进行霍夫曼编码生成码表，并对该片文章进行压缩-huffman encoder:collect the probility distribution of a english text file and using this probability as input and returns a huffman code table and compress this text file