c++链表统计英文文本。求代码，谢谢！

Question

Answer 1

第一是逐行读取文件，根据空格拆分单词

第二是链表检索单词，找到则该节点的计数器加一，找不到则加新节点

第三是节点有序插入，比较节点单词大小插入合适位置

第四是节点数据结构，串记录单词，整型为计数器，创建新节点时计数器为1

#include <string>
#include <iostream>
#include <stdio.h>
#include <fstream>
using namespace std;
typedef struct _NODE
{
	string word;
	int count;
	_NODE *next;
}NODE,*PNODE;

PNODE head = NULL;

PNODE searchString(string word)
{
	PNODE p = head;
	while(p != NULL)
	{
		if(p->word == word)
			return p;
		p = p->next;
	}
	return NULL;
}

PNODE addNode(string word)
{
	PNODE p = searchString(word);
	if(p != NULL)
		p->count++;
	else
	{
		p = new NODE;
		p->word = word;
		p->count = 1;
		p->next = NULL;
		//
		if(head == NULL || word < head->word)
		{
			p->next = head;
			head = p;
			return head;
		}
		else
		{
			PNODE q = head;
			PNODE prev = q;
			while(q != NULL)
			{
				if(word < q->word)
				{
					p->next = q;
					prev->next = p;
					break;
				}
				prev = q;
				q = q->next;
			}
			if(q == NULL)
				prev->next = p;
		}
	}
	return head;
}

void print()
{
	PNODE p = head;
	while(p != NULL)
	{
		cout<<p->word<<"  "<<p->count<<endl;
		p = p->next;
	}
}

void main()
{

	ifstream file("D:\\textfile.txt");
	if(!file.is_open())
	{
		cout<<"can't open this file"<<endl;
		return;
	}
	char buf[1024];
	while(!file.eof())
	{
		file.getline(buf,1024);
		char *p= strtok (buf, " ,!." );
		while(p != NULL)
		{
			head = addNode(p);
			p= strtok (NULL, " ,!." );
		}
	}
	file.close();
	//
	print();
}