Объяснить ход действий решения задачи на структуры с файлами

#include "stdafx.h" 
#include <stdio.h> 
#include <iostream> 
#include <fstream> 
#include <math.h> 
 
using namespace std;
 
struct product
{
    char name_product[10][128];
    int count_product[10];
    int price_product[10];
};
 
struct store
{
    int number;
    char manager_surname[128];
    product product;
};
 
store input(ifstream &file, int *sum)
{
    store in;
    int tmp = 0;
 
    file >> in.number;
    file >> in.manager_surname;
    for (int i = 0; i < 10; ++i)
    {
        file >> in.product.name_product[i];
        file >> in.product.count_product[i];
        file >> in.product.price_product[i];
        tmp += (in.product.price_product[i] * in.product.count_product[i]);
    }
    *sum = tmp;
 
    return in;
}
 
void print(store elem)
{
    cout << "Number store: " << elem.number << endl;
    cout << "Manager: " << elem.manager_surname << endl;
    cout << "Product | Price: " << endl;
    for (int i = 0; i < 10; ++i)
    {
        cout << elem.product.name_product[i] << " " << elem.product.price_product[i] << endl;
    }
}
 
void print(store *base, int size, int sum)
{
    
    for (int i = 0; i < size; i++)
    {
        print(base[i]);
        cout << "Money in store: " << sum << endl;
        
        cout << endl;
    }
}
 
int main(void)
{
    const int size = 10;
    store array_point[size];
    int sum = 0;
    
    ifstream file("test.txt");
    for (int i = 0; i < size; ++i)
    {
        array_point[i] = input(file, &sum);
    }
    
    print(array_point, size, sum);
 
    system("pause");
    return 0;
}

cout << "Number store: " << elem.number << endl;

for (int i = 0; i < 10; ++i) 
{ 
cout << elem.product.name_product[i] << " " << elem.product.price_product[i] << endl; 
}