Структуры данных, файлы

#include <iostream>
#include <fstream>
 
using namespace std;
 
struct Stadium {
    char name[30];
    int year;
    int amount;
    char type[50];
};
void outinf(Stadium& mass);
void in_inf(Stadium& mass);
 
int main(int argc, char** argv) {
    int size;
    int i;
 
    cout << "Enter amount of stadium: ";
    cin >> size;
    Stadium mass[size + 1];
    for (i = 0; i < size; i++) {
        outinf(mass[i]);
        cout << endl;
        in_inf(mass[i]);
    }
    cout << endl << "read from file" << endl;
    for (i = 0; i < size; i++) {
        cout << mass[i].name << endl;
        cout << mass[i].year << endl;
        cout << mass[i].amount << endl;
        cout << mass[i].type << endl;
    }
    ofstream Fout("stad.txt", ios::out);
    int k;
    cout << "Enter year:";
    cin >> k;
    for (i = 0; i < size; i++) {
        if (mass[i].year <= k) {
 
            Fout << "Name: " << mass[i].name << endl;
            Fout << "Year: " << mass[i].year << endl;
            Fout << "Amount: " << mass[i].amount << endl;
            Fout << "Disciplines: " << mass[i].type << endl;
        }
    }
        cout << endl << "Enter element(s)" << endl;
        cout << "Name: "; cin >> mass[size].name;
        cout << "Year: "; cin >> mass[size].year;
        cout << "Amount: "; cin >> mass[size].amount;
        cout << "Disciplines: "; cin >> mass[size].type;
 
        Fout << "name playground" << mass[size].name << endl;
        Fout << "year of playground" << mass[size].year << endl;
        Fout << "amount of playground" << mass[size].amount << endl;
        Fout << "Enter types of disciplines" << mass[size].type << endl;
 
        remove("out.txt");
        rename("stand.txt", "out.txt");
        
        system("pause");
        return 0;
}