#include?
#include?“Conio.h“
#define?N?7
#include?“math.h“
#include??
#include
#define?randomize（）?srand（（unsigned）time（NULL））


encode（
unsigned?int?*symbols????/*編碼輸出*/
unsigned?int?*data???????/*編碼輸入*/
unsigned?int?nbytes??????/*nbytes=n/16n為實際輸入碼字的數目*/
unsigned?int?startstate???/*定義初始化狀態*/
）
{
??int?j;
??unsigned?int?inputa1=0a2=0;

??for（j=0;j??{??input=*data;
?????data++;
?????*symbols?=?input^a1^a2;
??????symbols++;
?????*symbols?=?input^a2;
	??symbols++;
????a2=a1;
	a1=input;
??????
??}
??return?0;
}

?int?trandistance（int?m???????????/*符號m與從state1到state2時輸出符號的漢明距離如果state1無法到state2則輸出度量值為100*/
?????????????????int?state1
?????????????????int?state2）
{int?c;
?int?symsym1sym2;
?sym1=（（state2>>1）&