说明：  本程序运用C语言中结构化程序的思想，将程序分为函数模块的方法逐一实现。程序分为2个函数模块HUFFMAN(tree1)、HUFFMANCODE(code1,tree1)，和主体函数main；程序结构清楚，运行正常，正常实现哈夫曼编码。
(This procedure using C language in a structured process of thinking, the process is divided into function blocks to achieve the methods one by one. Procedures are divided into two function modules HUFFMAN (tree1), HUFFMANCODE (code1, tree1), and the main function main program structure clear and operating normally, the normal Huffman coding to achieve.)