用链表读写文件

用链表读写文件

将学生信息先以链表的形式存储在内存中，然后再写入到文件里，需要读取学生信息时，将文件的内容读取到链表里，然后在屏幕上显示。

// ConsoleApplication1.cpp: 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include 
#include 
#include 
#include 

using namespace std;

typedef struct student
{
     
	int num;
	char name[11];
	student *next;
}STU_T;

student *head, *tail;//头尾节点
ifstream inFile;
ofstream outFile;
void input();
void save();
void search();

int main(int argc, char *argv[])
{
     
	head = NULL;
	tail = NULL;
	input();
	save();
	search();
	system("pause");
	return 0;
}

void input()
{
     
	student *q;
	q = (student *)malloc(sizeof(student));
	cin >> q->num;
	while (q->num != 0)//按0结束
	{
     
		cin >> q->name; 
		if (head == NULL) 
		{
     
			head = q;
			head->next = NULL;
		}
		if (tail != NULL)
		{
     
			tail->next = q;
		}
		tail = q;
		tail->next = NULL;
		q = (student *)malloc(sizeof(student));
		cin >> q->num;
	}
}


void save()
{
     
	student *q;
	outFile.open("output.txt");
	for (q = head; q != NULL; q = q->next)
		outFile << q->num <<' '<< q->name << endl;
	outFile.close();
}

void search()
{
     
	student *q;
	q = (student *)malloc(sizeof(student));
	int num = 0;
	while (1)
	{
     
		cout << "请输入学号" << endl;
		cin >> num;
		inFile.open("output.txt");
		while (! inFile.eof())
		{
     
			inFile >> q->num >> q->name;
			if (q->num == num)
			{
     
				cout << q->name << endl;
				break;
			}
		}
		inFile.close();
	}
}