File opened

#include <iostream>
#include <fstream>

using namespace std;

void save_file(int[], size_t);
void read_file(int[], size_t);

int main() {

    int a[] = { 1, 2, 3, 4, 5 };

    save_file(a, 5);

    read_file(a, 5);

    return 0;
}

void save_file(int array[], size_t array_size) {
    ofstream file;
    file.open("test.txt");

    for (size_t i = 0; i < array_size; i++)
        file << array[i];

    file.close();
}

void read_file(int array[], size_t array_size) {
    ifstream file;

    file.open("test.txt");

    if (file.is_open())
        for (size_t i = 0; i < array_size; i++) {
            file >> array[i];
            cout << array[i];
        }

    file.close();
}