帶頭雙向鍊錶介面的實現

//帶頭雙向鍊錶

#include #include #include typedef int datatype;
typedef struct listnodelistnode;
typedef struct twolisttwolist;
//初始化
void twolistinit(twolist* pt);
//銷毀
void twolistdestroy(twolist* pt);
//尾插
void twolistpushback(twolist* pt, datatype x);
//頭插
void twolistpushfront(twolist* pt, datatype x);
//尾刪
void twolistpopback(twolist* pt);
//頭刪
void twolistpopfront(twolist* pt);
//查詢
listnode* twolistfind(twolist* pt, datatype x);
//在pos 前面插入
void twolistinsert(listnode* pos, datatype x);
//刪除pos位置的元素
void twolisterase(listnode* pos);
//刪除x
void twolistremove(twolist* pt, datatype x);
void printf(twolist* pt);

#include "twolist.h"

//初始化
void twolistinit(twolist* pt)
//銷毀
void twolistdestroy(twolist* pt)
free(head);
pt->head = null;
}//尾插
void twolistpushback(twolist* pt, datatype x)
//頭插
void twolistpushfront(twolist* pt, datatype x)
//尾刪
void twolistpopback(twolist* pt)
listnode* cur = pt->head->prev;
listnode* prev = cur->prev;
free(cur);
prev->next = pt->head;
pt->head->prev = prev;
}//頭刪
void twolistpopfront(twolist* pt)
//查詢
listnode* twolistfind(twolist* pt, datatype x)
cur = pt->head->next;
next = cur->next;
while (cur != pt->head)
cur = next;
next = next->next;
} return null;
}//在pos 前面插入
void twolistinsert(listnode* pos, datatype x)
//刪除pos位置的元素
void twolisterase(listnode* pos)
//刪除x
void twolistremove(twolist* pt, datatype x)
prev = cur;
cur = next;
next = next->next; }}
void printf(twolist* pt)
}

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