经统计，某机器14条指令的使用频度分别为：0.01,0.15,0.12,0.03,0.02,0.04,0.02,0.04,0.01,0.13,0.15,0.14,0.11,0.03。分别求出用等长码、Huffman码、只有两种码长的扩展操作码3种编码方式的操作码平均码长。 解： 等长操作码的平均码长=4位 Huffman编码的平均码长=3.38位 只有两种码长的扩展操作码的平均码长=3.4位。 9．若某机要求：三地址指令4条，单地址指令255条，零地址指令16条。设指令

用lz77算法进行压缩，对得到的结果再使用huffman编码的方法进行压缩。分别对lz77和huffman编码的原理进行说明。 -Lz77 algorithm to compress the results obtained using huffman encoding method to compress. Lz77 and huffman encoding principle is described.

COMPREE IMAGE USING HUFFMAN

C语言基础实现大小写字母转换，实现哈夫曼编码。对学习C用处大-C language based case conversion, Huffman encoding. Useful for learning C