哈夫曼树编码实验报告VIP免费

11数学学院数学类数学1班田娟、数据结构课程设计报告题目：哈夫曼编码/译码学院数学与信息科学学院学科门类理科专业数学类学号2013433033姓名田娟2014年12月30日22数学学院数学类数学1班田娟目录一、需求分析1．程序的功能··················································32．输入输出的要求··············································33．测试数据····················································3二、概要设计1．本程序所用的抽象数据类型的定义·······························32．主程序模块···················································33．主模块的流程及各子模块的主要功能·····························44．模块之间的层次关系···········································4三、详细设计1．采用c语言定义相关的数据类型·································42.伪码算法·····················································5四、调试分析1．调试中遇到的问题及对问题的解决方法···························15五、使用说明及测试结果1.建立哈夫曼树，输入叶子结点个数，权值，字符集··················152.编码··························································153.译码··························································164.显示码文······················································165.显示哈夫曼树··················································16六、源程序一、需求分析1．程序的功能；哈夫曼编码是一种应用广泛而有效的数据压缩技术。利用哈夫曼编码进行通33数学学院数学类数学1班田娟信可以大大提高信道利用率，加快信息传输速度，降低传输成本。数据压缩的过程称为编码，解压缩的过程称为译码。进行信息传递时，发送端通过一个编码系统对待传数据（明文）预先编码，而接收端将传来的数据（密文）进行译码。2．输入输出的要求；：2.1．构造哈夫曼树及哈夫曼编码：从终端读入字符集大小n、n个字符以及n个对应的权值，建立哈夫曼树；利用已经建好的哈夫曼树求每个叶结点的哈夫曼编码，并保存。2.2编码：利用已构造的哈夫曼编码对“明文”文件中的正文进行编码，然后将结果存入“密文”文件中。2.3．译码：将“密文”文件中的0、1代码序列进行译码。2.4．打印“密文”文件：将文件以紧凑格式显示在终端上，每行30个代码；同时，将此字符形式的编码文件保存。2.5．打印哈夫曼树及哈夫曼编码：将已在内存中的哈夫曼树以凹入表形式显示在终端上，同时将每个字符的哈夫曼编码显示出来；并保存到文件。3．测试数据。3.1.令叶子结点个数N为4，权值集合为{1,3,5,7}，字符集合为{A,B,C,D}，且字符集与权值集合一一对应。3.2.请自行选定一段英文文本，统计给出的字符集，实际统计字符的频度，建立哈夫曼树，构造哈夫曼编码，并实现其编码和译码。二、概要设计1．本程序所用的抽象数据类型的定义；classHuffmanTree//哈夫曼树{private:HuffmanNode*Node;//Node[]存放哈夫曼树intLeafNum;//哈夫曼树的叶子个数，也是源码个数2.主程序模块main()2.2建立哈夫曼树函数//函数功能：建立哈夫曼树voidHuffmanTree::CreateHuffmanTree()2.3函数功能：为哈夫曼树编码voidHuffmanTree::Encoder()2.4函数功能：对哈夫曼树进行译...