cppFileIOBasicProducts

#include <iostream>
#include <fstream>

struct Product
{
    int id;
    char name[15];
    int count;

    void print()
    {
        std::cout << id << ' ' << name << ' ' << count << '\n';
    }
};

void printProduct(const Product& product)
{
    std::cout << product.id << ' ' << product.name << ' ' << product.count << '\n';
}

void listProducts(Product* begin, Product* end)
{
    for (auto product{ begin }; product != end; ++product)
    {
        product->print();
    }
}

void listProducts(Product* products, int productsSize)
{
    for (int i{ 0 }; i < productsSize; ++i)
    {
        products[i].print();
        //printProduct(products[i]);
    }
}

void saveProducts(Product* begin, Product* end)
{
    std::ofstream outf;
    outf.open("products.txt");
    for (auto product{ begin }; product != end; ++product)
    {
        outf << product->id << '\n';
        outf << product->name << '\n';
        outf << product->count << '\n';
    }
    outf.close();
}

void loadProducts(Product* begin, Product* end)
{
    std::ifstream inf;
    inf.open("products.txt");
    for (auto product{ begin }; product != end; ++product)
    {
        inf >> product->id;

        inf.ignore(100, '\n');
        inf.getline(product->name, 15);

        inf >> product->count;
    }
    inf.close();
}

int main()
{
    const int productsSize{ 3 };
    Product products[productsSize]{
        {1,"apple",12},
        {2,"orange",24},
        {3,"lemon",42}
    };

    auto productsEnd{ products + productsSize };

    std::cout << "Original Products:\n";
    listProducts(products, productsEnd);
    //listProducts(products, productsSize);
    std::cout << '\n';

    saveProducts(products, productsEnd);

    Product fileProducts[productsSize];
    auto fileProductsEnd{ fileProducts + productsSize };

    loadProducts(fileProducts, fileProductsEnd);

    std::cout << "Loaded Products:\n";
    listProducts(fileProducts, fileProductsEnd);
    std::cout << '\n';

    std::cout << std::boolalpha << (products[0].id == fileProducts[0].id) << '\n' <<
        (strcmp(products[0].name, fileProducts[0].name) == 0) << '\n' <<
        (products[0].count == fileProducts[0].count) << '\n';
}