双向链表的练习代码

head.h

#ifndef __HEAD_H__
#define __HEAD_H__
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef int database;
typedef struct double_link_list{
	union{
		database data;
		int len;
	};
	struct double_link_list* pre;
	struct double_link_list* next;

}dbLinkList,*dbLinkListp;

dbLinkListp head_create();
dbLinkListp create(database data);
int head_insert(dbLinkListp head,database data);
int tail_insert(dbLinkListp head,database data);
int output(dbLinkListp head);
int head_delete(dbLinkListp head);
int tail_delete(dbLinkListp head);
int pos_insert(dbLinkListp head,int pos,database data);
int pos_delete(dbLinkListp head,int pos);

#endif

fun.c

#include "head.h"
/*
 * function:    头结点创建
 * @param [ in] 
 * @param [out] 
 * @return      
 */
dbLinkListp head_create(){
	dbLinkListp head=(dbLinkListp)malloc(sizeof(dbLinkList));
	if(NULL==head){
		puts("malloc is NULL,failed");
		return NULL;
	}
	head->pre=NULL;
	head->next=NULL;
	head->len=0;
	return head;
}
/*
 * function:    创建节点
 * @param [ in] 
 * @param [out] 
 * @return      
 */
dbLinkListp create(database data){
	dbLinkListp new=(dbLinkListp)malloc(sizeof(dbLinkList));
	if(NULL==new){
		puts("malloc is NULL,failed");
		return NULL;
	}
	new->data=data;
	new->pre=NULL;
	new->next=NULL;
	puts("node create success");
	return new;
}
/*
 * function:    判空
 * @param [ in] 
 * @param [out] 
 * @return      
 */
int void_point(dbLinkListp head){
	if(NULL==head){
		puts("----why give me a null head point----");
		return -1;
	}
	return 0;
}
/*
 * function:    头插
 * @param [ in] 
 * @param [out] 
 * @return      
 */
int head_insert(dbLinkListp head,database data){
	if(void_point(head))
		return -1;
	//头插
	dbLinkListp new=create(data);
	new->next=head->next;
	if(head->next!=NULL)
		new->next->pre=new;
	head->next=new;
	new->pre=head;

	head->len++;
	puts("head insert success");
	return 0;
}
/*
 * function:    尾插
 * @param [ in] 
 * @param [out] 
 * @return      
 */
int tail_insert(dbLinkListp head,database data){
	if(void_point(head))
		return -1;
	//尾插
	dbLinkListp p=head;
	while(p->next!=NULL)
		p=p->next;
	dbLinkListp new=create(data);

	new->next=p->next;
	new->pre=p;
	p->next=new;

	head->len++;
	puts("tail insert success.");
	return 0;
}
/*
 * function:    输出
 * @param [ in] 
 * @param [out] 
 * @return      
 */
int output(dbLinkListp head){
	if(void_point(head))
		return -1;
	while(head->next!=NULL){
		printf("%d\t",head->next->data);
		head=head->next;
	}
	puts("output done");
	return 0;
}
/*
 * function:   头删
 * @param [ in] 
 * @param [out] 
 * @return      
 */
int head_delete(dbLinkListp head){
	if(void_point(head))
		return -1;
	if(head->next==NULL){
		puts("there is no assignment to delete.");
		return -1;
	}
	dbLinkListp del=head->next;
	if(head->next->next!=NULL)
	head->next->next->pre=head;
	head->next=head->next->next;

	free(del);
	del=NULL;
	head->len--;
	puts("head_delete success");
	return 0;
}
/*
 * function:    尾删
 * @param [ in] 
 * @param [out] 
 * @return      
 */
int tail_delete(dbLinkListp head){
	if(void_point(head))
		return -1;
	if(head->next==NULL){
		puts("there is no assignment to delete.");
		return -1;
	}
	dbLinkListp p=head;
	//找到倒数第一个
	while(p->next!=NULL){
		p=p->next;
	}
	p->pre->next=p->next;
	free(p);
	p=NULL;
	head->len--;
	puts("tail delete success");
	return 0;
}
/*
 * function:    指定位置插入
 * @param [ in] 
 * @param [out] 
 * @return      
 */
int pos_insert(dbLinkListp head,int pos,database data){
	if(void_point(head))
		return -1;

	//判断位置合理性
	if(pos<1||pos>head->len+1){
		puts("your position is illegal");
		return -1;
	}
	dbLinkListp p=head;
	//找到指定位置前一位
	while(pos--!=1){
		p=p->next;
	}
	dbLinkListp new=create(data);

	if(p->next!=NULL){
		new->next=p->next->next;
		p->next->next->pre=new;
	}
	new->pre=p;
	p->next=new;

	head->len++;
	puts("pos insert success");
	return 0;
}
/*
 * function:    指定位置删除
 * @param [ in] 
 * @param [out] 
 * @return      
 */
int pos_delete(dbLinkListp head,int pos){
	if(void_point(head))
		return -1;
	if(head->next==NULL){
		puts("there is no assignment to delete.");
		return -1;
	}
	//判断位置合理性
	if(pos<1||pos>head->len){
		puts("your position is illegal");
		return -1;
	}
	dbLinkListp p=head;
	//找到指定位置前一位
	while(pos--!=1){
		p=p->next;
	}
	printf("pos-1=%d\t",p->data);
	//删除
	dbLinkListp del=p->next;
	p->next=p->next->next;
	if(p->next!=NULL)
		p->next->pre=p;

	free(del);
	del=NULL;
	puts("pos delete success");
	return 0;
}

main.c

#include "head.h"
int main(int argc, const char *argv[])
{
	dbLinkListp head=head_create();
	head_insert(head,9);
	head_insert(head,8);
	head_insert(head,6);
	head_insert(head,5);
	tail_insert(head,7);
	output(head);
	//head_delete(head);
	//tail_delete(head);
	//pos_insert(head,6,66);
	//pos_delete(head,5);
	output(head);


	return 0;
}

今日思维导图哈