C语言之单向链表详解及实例代码

#include <stdio.h>
#include <math.h>
#include <cstring>
#include <memory.h>
#include <malloc.h>


//节点的定义
typedef struct Node {
 void *data; //数据域 //链域
 struct Node *next;
} NodeStruct, *pNode;


pNode head = NULL;

 


typedef char (*pCompareFunc)(void *a, void *b);
typedef void* (*pChar)(void *p);


// 字符串判断
int str_compare(void *a, void *b) {
 char *pa = (char*)a;
 char *pb = (char*)b;
 return strcmp(pa , pb);
}


// 分配一个节点
pNode allocate_node(void *data, pChar char_func) {
 pNode node = allocate();
 node->data = char_func(data);
 return node;
}


// 创建节点
pNode allocate() {
 void *p = malloc(sizeof(NodeStruct));
 pNode node = (pNode)p;
 node->next = NULL;
 node->data = NULL;
 return node;
}


// 添加一个节点
void insertNode(pNode node){
 if (head == null){
  head=node;
  }
  else {
  node->next = head;
  head = node;
  }
}


void* char_char(void *p) {
 char* pa = (char*)malloc(sizeof(char));
 memcpy(pa, p, sizeof(char));
 return pa;
}


// 初始化节点
pNode allocate_node(void *data, pChar char_func) {
 pNode node = allocate();
 node->data = char_func(data);
 return node;
}

 
 

 

 


// 释放资源
void free_list(pNode node) {
 pNode next = node;


 while (next != NULL) {
  if (next->data != NULL)
   free(next->data);
  pNode temp = next;
  next = next->next;
  free(temp);
 }
}


// 1.1 添加一个节点
void insert(pNode node) {
 if (head == NULL)
  head = node;
 else {
  node->next = head;
  head = node;
 }
}


//1.2查找
int str_search(void* data,pCompareFunc compare){
 pNode next = head;
 pNode prev = NULL;
 while (next != NULL ) {
  if (compare(data, next->data) == 0) {
   // 如果查找到了，就退出返回1
   return 1;
   break;
  }
  prev = next;
  next = next->next;
 }
 // 如果一直查找不到，就返回0
 return 0;
}


// 1.3删除节点
void remove(void* data,pCompareFunc compare) {
 pNode next = head;
 pNode prev = NULL;
 while (next != NULL) {


  if (compare(data, next->data) == 0) {
   if (prev == NULL) {
    head = next->next;
    next->next = NULL;
    free_list(next);
   } else {
    prev->next = next->next;
    next->next = NULL;
    free_list(next);
   }
   break;
  }
  prev = next;
  next = next->next;
 }


}


//1.4反转
void invert_order()
{
  node *This,*prev;
  p=head.next;
  This=NULL;
  while(p) {
    prev=This;
    This=p;
    p=p->next;
    This->next=prev;


  }
  head.next=This;
}

 

 

 


void main(){
 // 1单向链表
 char a1[] = 'aaa1';
 char a2[] = 'aaa2';
 char a3[] = 'aaa3';
 // 1.1添加
 insertNode(allocate_node(a1, init_char));
 insertNode(allocate_node(a2, init_char));
 insertNode(allocate_node(a3, init_char));
 // 1.2查找
 int flag = 0;
 flag = str_search(&a2,str_compare);
 // 1.3删除
 remove(&a2,str_compare);
 // 1.4反转
  invert_order();


}