c³ÌÐòʵÏÖÏãÅ©±àÂë
#include <stdio.h>
#include <math.h>
#include <string.h>
int i,j,n,k,b;
float addp;
char bitw[20];
/*³õʼ»¯½á¹¹ÌåÆäÖУºsΪÐÅÔ´·ûºÅ£»pΪÐÅÔ´·ûºÅ¸ÅÂÊ£»paddΪÀÛ¼Ó¸ÅÂÊ£»
l_fΪ-log[p(s[i])]¼´¹À¼ÆÂë×Ö³¤¶È£»lΪʵ¼ÊÐèÒªÂë×Ö³¤¶È£»wΪÂë×Ö*/
struct shan
{char s[20];
float p;
float padd;
float l_f;
int l;
char w[20];
}data[12];
/*ÒÀÐÅÔ´¸ÅÂʶԸ÷ÐÅÔ´·ûºÅÅÅÐòMoai&KevinÔ´´£¡*/
void sequ(struct shan x[],int n)
{
struct shan temp;
for(i=0;i<n;i++)
for(j=i;j<n;j++)
{if(x[i].p<x[j].p)
{
temp=x[j];
x[j]=x[i];
x[i]=temp;
}
}
}
/*¼ÆËãÀÛ¼Ó¸ÅÂÊ*/
void countpadd(struct shan x[],int n)
{
addp=0;
x[0].padd=0;
for(i=0;i<n;i++)
{
addp+=x[i].p;
x[i+1].padd=addp;
}
}
/*¼ÆËã¹À¼ÆÂë×Ö³¤¶Èl_f£¬ÒÔ¼°Moai&KevinÔ´´£¡*/Âë×Ö³¤¶Èl*/
void count_l(struct shan x[],int n)
{
for(i=0;i<n;i++)
{
x[i].l_f=-log(x[i].p)/log(2);
if((x[i].l_f-(int)x[i].l_f)>0)
x[i].l=(int)x[i].l_f+1;
else x[i].l=(int)x[i].l_f;
}
}
/*¶þ½øÖÆת»»*/
void covbit(float a,int lc)
{
for(j=0;j<lc;j++)
{
b=(int)(a*2);
bitw[j]=b+48;
a=2*a-int(a*2);
}
}
main()
{
printf("please input the number of symbols of source(n<=10):n=");
scanf("%d",&n);
printf("please input the the source symbols and their probabilities\n");
/*»ñÈ¡ÐÅÔ´·ûºÅ*/
for(i=0;i<n;i++)
{
scanf("%s",data[i].s);
}
/*»ñÈ¡ÐÅÔ´Moai&KevinÔ´´£¡*/¸ÅÂÊ*/
for(i=0;i<n;i++)
{printf("P(%s)=",data[i].s);
scanf("%f",&data[i].p);
}
sequ(data,n);
countpadd(data,n);
count_l(data,n);
/*ÔڽṹÌåÖвúÉúÂë×Ö*/
for(i=0;i<n;i++)
{
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Information in this article applies to:
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