输入任意字符串，str[]={"a","b","c","d","e","f","g","h"};每种字符出现频率fnum[]={0.07,0.19,0.02,0.06,0.32,0.03,0.21,0.1}，根据出现频率，利用哈夫曼编码原理，对每个字符进行（0,1）编码，并输出每种字符编码。