Cтруктура WORKER и файловый ввод/вывод

#include "stdafx.h"
#include <iostream>
#include <fstream>
using namespace std;
struct worker
{
    char surname[20];
    char app[20];
    int year;
};
void vvod(worker a[], int n);
void searcher(worker a[], int n);
void menu();
 
int _tmain(int argc, _TCHAR* argv[])
{
    int v,n;
    cout << "Enter number of workers:" << endl;
    cin >> n;
    worker *a = new worker[n];
    do
    {
        menu();
        cin >> v;
        switch (v)
        {
        case 1:system("cls"); vvod(a,n); break;
        case 2:system("cls"); searcher(a,n); break;
        }
 
    } while (v != 3);
    system("pause");
    return 0;
}
void menu()
{
    cout << "1.Input data of workers" << endl;
    cout << "2.Search workers" << endl;
    cout << "3.Exit" << endl;
}
void vvod(worker a[],int n)
{
    ofstream fout;
    fout.open("data.txt");
    for (int i(0); i < n; i++)
    {
        cout << "Enter data of " << i + 1 << " worker" << endl;
        cout << "Surname:" << endl;
        fout <<  a[i].surname;
        cout << "Appointment: " << endl;
        fout << a[i].app;
        cout << "Year: " << endl;
        fout << a[i].year;
    }
    fout.close();
}
void searcher(worker a[], int n)
{
    ifstream fin("data.txt");
    int temp;
    int *a = new int [n];
    int k = 0;
    cout << "Enter year for search" << endl;
    cin >> temp;
    for (int i(0); i < n; i++)
    {
        fin >> a[i];
        if (a[i]>= temp)
        {
            /*cout << "Surname: " << a[i].surname << endl;
            cout << "Appointment: " << a[i].app << endl;
            cout << "Year: " << a[i].year << endl;*/
            k++;
        }
    }
    if (k == 0)
        cout << "There aren't workers" << endl;
    fin.close();
    delete[]a;
}