Вывод односвязного списка

#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <sstream>
using namespace std;
struct phone
{
    char marka[10];
    char model [10];
    int year;
    int cost;
    phone *next;
};
phone* head = 0;
phone* curr = head;
void menu()
{
    system("cls");
    cout << "1-Filling a structure" << endl;
    cout << "2-Structure output" << endl;
    cout << "3-Sorting" << endl;
    cout << "4-Delete" << endl;
    cout << "5-Add" << endl;
    cout << "6-Binary filling" << endl;
    cout << "7-Binary output" << endl;
    cout << "8-Exit" << endl;
}
void menu_sort()
{
    system("cls");
    cout << "1-Marka" << endl;
    cout << "2-Year" << endl;
    cout << "3-Model" << endl;
    cout << "4-Cost" << endl;
 
}
 
void filling()
{
    cout << "Enter amount of struct" << endl;
    int amount, year, cost;
    char marka[10], model[10];
    cin >> amount;
    for (int i(0); i < amount; i++)
    {
        if (!head)
        {
            head = new phone;
            cout << "Marka: "; cin >> marka;
            strcpy_s(head->marka, 10, marka);
            cout << "Model: "; cin >> model;
            strcpy_s(head->model, 10, model);
            cout << "Year: "; cin >> year;
            head->year = year;
            cout << "Cost: "; cin >> cost;
            head->cost = cost;
            head->next = NULL;
            curr = head;
            cout << endl;
        }
        else
        {
            curr->next = new phone;
            cout << "Marka: "; cin >> marka;
            strcpy_s(curr->marka, 10, marka);
            cout << "Model: "; cin >> model;
            strcpy_s(curr->model, 10, model);
            cout << "Year: "; cin >> year;
            curr->year = year;
            cout << "Cost: "; cin >> cost;
            curr->cost = cost;
            curr->next = NULL;
            cout << endl;
        }
    }
}
void output()
{
    curr = head;
    while (curr !=NULL)
    {
        cout << curr->marka << " " << curr->model << " " << curr->year << " " << curr->cost << " ";
        system("pause");
        curr = curr->next;
    }
    system("pause");
}
 
int main()
{
    int x, k = 0;
    system("cls");
    while (k == 0)
    {
        menu();
        cout << "Choise a number of menu" << endl;
        cin >> x;
        switch (x)
        {
        case 1:
            system("cls");
            filling();
            break;
        case 2:
            system("cls");
            output();
            break;

if(!head)
    head=curr=new phone;
else
    curr=curr->next=new phone;
//а здесь вставить код заполнения curr