i want to write a program that read file2.txt and compare each words in file2.txt with noindex.txt. If there are any words which is in file2.txt but not in noindex.txt, i am suppose to put it in a linked list, then later save the linked list in index.txt.Code:#include <iostream> #include <string> #include <fstream> using namespace std; class LinkedList { public: LinkedList(); ~LinkedList(); void push_back(string word); void pop_front(); bool empty() const; void save(); private: struct Node { string item; Node* next; }; int Size; Node *head, *tail, *cur, *prev; }; LinkedList::LinkedList():Size(0) { head = tail = cur = prev = NULL; } LinkedList::~LinkedList() { while(!empty()) pop_front(); } void LinkedList::push_back(string word) { if(empty()) { head = new Node; head->item = word; head->next = NULL; tail = head; } else { Node* slot = new Node; slot->item = word; slot->next = NULL; tail->next = slot; tail = slot; } Size++; } void LinkedList::pop_front() { if(empty()) { cout << "Error: Attempt to pop empty list" << endl; system("pause"); exit(1); } Node* oldhead = head; head = head->next; delete oldhead; Size--; } bool LinkedList::empty() const { if(head == NULL) return true; else return false; } void LinkedList::save() { ofstream fout("index.txt"); if(fout.is_open()) { cur=head; while(cur != NULL) { fout << cur->item << endl; cur = cur->next; } } } int main() { LinkedList index; ifstream fin_noindex; ifstream fin_f1; string s, temp; int found; fin_f1.open("file2.txt"); while(fin_f1.is_open()) { fin_f1 >> s; fin_noindex.open("noindex.txt"); found = 0; while(fin_noindex.is_open()) { fin_noindex >> temp; if(s==temp) { found++; } } fin_noindex.close(); if(found==0) { index.push_back(s); } } fin_f1.close(); index.save(); return 0; }
the problem now is: why the program went to an infinite loop ?
actually i am not so sure wether my implementation or way is correct. Please correct and comment on my code. Thanks in advance.
