说明：  实现一个 哈夫曼编 码系统，系统包括以下功能： (1) 字符信息统计 读取待编码的源 文件 SourceFile.txt ，统计出现的字符及其频率 。 (2) 建立哈夫曼树 ：根据统计结果建立 哈夫曼树 。 (3) 建立哈夫曼码表：利用得到的哈夫曼树，将各字符对应的编码表保存在文件建立哈夫曼码表：利用得到的哈夫曼树，将各字符对应的编码表保存在文件Code.txtCode.txt中。 (4) 对源文件进行编码：根据哈夫曼码表，将对源文件进行编码：根据哈夫曼码表，将SourceFile.txtSourceFile.txt中的字符转换成相应的中的字符转换成相应的编码编码文件文件ResultFile.txtResultFile.txt。
(Achieve one Huffman coding system, including the following functions: (1) Character information statistics reads the source file sourcefile.txt to be encoded, and counts the characters and their frequency. (2) Establish Huffman tree: establish Huffman tree according to the statistical results. (3) establish Huffman code table: save the corresponding code table of each character in the file by using the Huffman tree obtained; save the corresponding code table of each character in the file code.txtcode.txt by using the Huffman tree obtained. (4) encoding the source file: encoding the source file according to the Huffman code table: converting the characters in sourcefile.txtsourcefile.txt to the corresponding characters in the corresponding encoding file resultfile.txtresultfile.txt according to the Huffman code table.)