C语言实现无头单向链表的示例代码

static SLTnode* BuySListNode(SLTDataType x)
{
 SLTNode* newnode = (SLTNode*)malloc(sizeof(SLTNode));
 //开辟失败
 if (newnode == NULL)
 {
  printf("malloc fail\n");
  exit(-1);
 }
 //初始化
 newnode->data = x;
 newnode->next = NULL;
 return newnode;
}

void SListPushBack(SLTNode** pphead, SLTDataType x)
{
 assert(pphead);
 //找尾
 SLTNode* tail = *pphead;
 if (tail == NULL)
 {
  tail = BuySListNode(x);
  *pphead = tail;
 }
 else
 {
  while (tail->next != NULL)
  {
   tail = tail->next;
  }
  SLTNode* newnode = BuySListNode(x);
  tail->next = newnode;
 }
}

void SListPopBack(SLTNode** pphead)
{
 assert(pphead);
 assert(*pphead);//没有节点断言报错
 SLTNode* prev = NULL;
 SLTNode* tail = *pphead;
 while (tail->next != NULL)
 {
  prev = tail;
  tail = tail->next;
 }
 free(tail);
 tail = NULL;
 if (prev != NULL)
  prev->next = NULL;
 else
  *pphead = prev;
}

void SListPrint(SLTNode* phead)
{
 SLTNode* cur = phead;
 while (cur)
 {
  printf("%d->", cur->data);
  cur = cur->next;
 }
 printf("NULL\n");
}

int SListSize(SLTNode* phead)
{
 //计数器
 int count = 0;
 SLTNode* cur = phead;
 while (cur)
 {
  count++;
  cur = cur->next;
 }
 return count;
}

bool SListEmpty(SLTNode* phead)
{
 return phead == NULL;
}

SLTNode* SListFind(SLTNode* phead, SLTDataType data)
{
 //通过数据查找节点-遍历节点，判断值是否相等
 SLTNode* cur = phead;
 while (cur)
 {
  if (cur->data == data)
   return cur;
  cur = cur->next;
 }
 return NULL;
}

void SListPushFront(SLTNode** pphead, SLTDataType x)
{
 assert(pphead);
 SLTNode* newnode = BuySListNode(x);
 newnode->next = *pphead;
 *pphead = newnode;
}

void SListPopFront(SLTNode** pphead)
{
 assert(pphead);
 assert(*pphead);
 SLTNode* next = (*pphead)->next;
 free(*pphead);
 *pphead = NULL;
 *pphead = next;
}

void SListInsert(SLTNode* pos, SLTDataType x)
{
 assert(pos);
 SLTNode* newnode = BuySListNode(x);
 SLTNode* next = pos->next;
 pos->next = newnode;
 newnode->next = next;
}

void SListErase(SLTNode* pos)
{
 assert(pos);
 assert(pos->next);
 SLTNode* next = pos->next;
 pos->next = next->next;
 free(next);
 next = NULL;
}

void SListDestroy(SLTNode** pphead)
{
 assert(pphead);
 SLTNode* cur, * nextnode;
 cur = *pphead;
 nextnode = NULL;
 while (cur)
 {
  nextnode = cur->next;
  free(cur);
  cur = nextnode;
 }
 *pphead = NULL;
}

#include<stdio.h>
#include<assert.h>
#include<stdlib.h>
#include<stdbool.h>

typedef int SLTDataType;//重定义可便于修改值的数据类型
1
typedef struct SListNode
{
 SLTDataType data;
 struct SListNode* next;
}SLTNode;//重定义可减少代码冗余