example199.cpp

Data Abstraction & Problem Solving with C++源码

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

struct Node
{  int item;
   Node *next;
}; // end struct

int main()
{
   Node *head = NULL;
   head = new Node;
   head->item = 1;
   Node *p = head;
   for (int i=2; i<=5; i++)
   {
	   p->next = new Node;
       p = p->next;
       p->item = i;
   }
   p->next = NULL;

   // Saves a linked list's data in a text file of
   // integers; head points to the linked list.

   string fileName = "numbers.txt";

   // fileName is a string that names an external text
   // file to be created
   ofstream outFile(fileName);

   // traverse the list to the end, writing each item
   for (Node *cur = head; cur != NULL; cur = cur->next)
      outFile << cur->item << endl;

   outFile.close();
   // Assertion: The text file contains the linked
   // list抯 data in its original order.

   return 0;
}  // end main