数据结构c语言实现之单链表

目录

单链表的接口

接口的实现

#pragma once
#include
#include
#include

typedef int SlistDateType;

typedef struct SlistNode
{
	struct SlistNode* next;
	SlistDateType data;
}Slist;

//单链表不需要初始化

//获取一个结点
Slist* GetSlistNode(SlistDateType x);

//头插
void Slistpush_front(Slist** s, SlistDateType x);

//头删
void Slistpop_front(Slist** s);

//尾插
void Slistpush_back(Slist** s, SlistDateType x);

//尾删
void Slistpop_back(Slist** s);

//查找数据
Slist* Slistfind(Slist* s, SlistDateType x);

//pos位置之前插入
void Slistinsert(Slist** s, Slist* pos, SlistDateType x);

//pos位置之后插入
void Slistinsertafter(Slist* pos, SlistDateType x);

//pos位置删除
void Slisterase(Slist** s, Slist* pos);

//打印单链表
void Slistprint(Slist* s);

//销毁单链表
void Slistdestroy(Slist** s);

注：因为在pos之前插入数据我们需要一个prev来记录之前的结点位置，所以实际中我们使用的是在pos后面插入数据

接口的实现

#define  _CRT_SECURE_NO_WARNINGS
#include"Slist.h"

//获取一个结点
Slist* GetSlistNode(SlistDateType x)
{
	Slist* s = (Slist*)malloc(sizeof(Slist));
	if (s == NULL)
	{
		printf("malloc faildn");
		exit(0);
	}
	s->data = x;
	s->next = NULL;
	return s;
}

//头插
void Slistpush_front(Slist** s, SlistDateType x)
{
	assert(s);
	Slist* newnode = GetSlistNode(x);
	if (*s == NULL)
	{
		*s = newnode;
	}
	else
	{
		newnode->next = *s;
		*s = newnode;
	}
}

//头删
void Slistpop_front(Slist** s)
{
	assert(s);
	assert(*s);
	Slist* del = *s;
	*s = (*s)->next;
	free(del);
	del = NULL;
}

//尾插
void Slistpush_back(Slist** s, SlistDateType x)
{
	assert(s);
	Slist* newnode = GetSlistNode(x);
	if (*s == NULL)
	{
		*s = newnode;
	}
	else
	{
		Slist* tail = *s;
		while (tail->next)
		{
			tail = tail->next;
		}
		tail->next = newnode;
	}
}

//尾删
void Slistpop_back(Slist** s)
{
	assert(s);
	assert(*s);
	Slist* prev = *s;
	Slist* tail = *s;
	tail = tail->next;
	while (tail->next)
	{
		prev = prev->next;
		tail = tail->next;
	}
	prev->next = NULL;
	free(tail);
	tail = NULL;
}

//查找数据
Slist* Slistfind(Slist* s, SlistDateType x)
{
	Slist* tail = s;
	while (tail)
	{
		if (tail->data == x)
		{
			return tail;
		}
		tail = tail->next;
	}
	return NULL;
}

//pos位置之前插入
void Slistinsert(Slist** s, Slist* pos, SlistDateType x)
{
	assert(s);
	assert(pos);
	Slist* prev = *s;
	if (prev == pos)
	{
		Slistpush_front(s, x);
		return;
	}
	while (prev->next != pos)
	{
		prev = prev->next;
	}
	Slist* newnode = GetSlistNode(x);
	prev->next = newnode;
	newnode->next = pos;
}

//pos位置之后插入
void Slistinsertafter(Slist* pos, SlistDateType x)
{
	assert(pos);
	Slist* newnode = GetSlistNode(x);
	newnode->next = pos->next;
	pos->next = newnode;
}

//删除pos位置
void Slisterase(Slist** s, Slist* pos)
{
	assert(s);
	Slist* prev = *s;
	if (pos == *s)
	{
		Slist* del = *s;
		*s = (*s)->next;
		free(del);
		del = NULL;
		return;
	}
	while (prev->next != pos)
	{
		prev = prev->next;
	}
	Slist* del = pos;
	prev->next = pos->next;
	free(del);
}

//打印单链表
void Slistprint(Slist* s)
{
	Slist* cur = s;
	while (cur)
	{
		printf("%d ", cur->data);
		cur = cur->next;
	}
}

//销毁单链表
void Slistdestroy(Slist** s)
{
	assert(s);
	assert(*s);
	Slist* del = *s;
	while (*s)
	{
		*s = (*s)->next;
		free(del);
		del = NULL;
	}
}