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  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  4. struct Node{
  5.     string mail;
  6.     Node* next;
  7.  
  8. };
  9. class LinkedList{
  10. public:
  11.     Node* head;
  12.     Node* tail;
  13.     LinkedList(){
  14.         head = nullptr;
  15.         tail = nullptr;
  16.     }
  17.     void printAllMails(){
  18.         Node* temp = head;
  19.         while(temp != nullptr){
  20.             cout << temp->mail << endl;
  21.             temp = temp->next;
  22.         }
  23.     }
  24.     bool searchForMail(string email){
  25.         Node* temp = head;
  26.         while(temp != nullptr){
  27.             if(temp->mail == email){
  28.                 return true;
  29.             }
  30.             temp = temp->next;
  31.         }
  32.         return false;
  33.     }
  34.     bool addMail(string email){
  35.         if(searchForMail(email)){
  36.             return false;
  37.         }
  38.         Node* newMailNode = new Node();
  39.         newMailNode->mail = email;
  40.         newMailNode->next = nullptr;
  41.         if(head == nullptr){
  42.             head = newMailNode;
  43.             tail = newMailNode;
  44.         }else{
  45.             tail->next = newMailNode;
  46.             tail = newMailNode;
  47.         }
  48.         return true;
  49.     }
  50. };
  51. int main() {
  52.     cout << "Hello, World!" << std::endl;
  53.     LinkedList linkedList;
  54.     linkedList.addMail("mail1");
  55.     linkedList.addMail("mail2");
  56.     linkedList.addMail("mail3");
  57.     linkedList.printAllMails();
  58.     bool isFound = linkedList.searchForMail("mail4");
  59.     cout<<isFound<<endl;
  60.     return 0;
  61. }
  62.  
Success #stdin #stdout 0.01s 5312KB
comments (?)
stdin 
Standard input is empty
stdout 
Hello, World!
mail1
mail2
mail3
0
https://ideone.com/Pr73V0
language:
C++ (gcc 8.3)
created:
15 days ago
visibility:
public

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