Открытие файла

#include <fstream>
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <windows.h>
#include "functions_bridge.h"



int main ()
{
    int i;
    char i_char[10];

    CreateDirectory("D:\\BD_bridge", NULL);

    FILE *file;
    char* file_name = "D:\\BD_bridge\db_bridge.dat";

    file = fopen (file_name, "rb");
    if(file == NULL)
    {
        file = fopen(file_name, "w+b" );
    }
    else
    {
        std::cout<<"  Database file exists, create new?"<<endl<<"  1 - Yes"<<endl<<"  2 - No"<<endl;
        std::cin>>i;
        if (i==1)
        {
            char* str = ".dat";
            char file_name2 [50] = "D:\\BD_bridge\db_bridge";

            std::cout<<"  Select the number of new database"<<endl;
            std::cin>>i;

            strcat(file_name2, itoa(i, i_char, 10));
            strcat(file_name2, str);
            file_name = file_name2;
            file = fopen(file_name, "w+b" );
        }
    }

    fclose (file);

    i = 1;

    while (i != 5)
    {
        std::cout<<endl<<"  Menu:"<<endl;
        std::cout<<"  1 - Creat"<<endl<<"  2 - Review"<<endl<<"  3 - Sorting"<<endl<<"  4 - Search"<<endl<<"  5 - Exit"<<endl;
        std::cin>>i;

        switch (i)
        {
        case 1: Create (file, file_name); break;
        case 2: Review (file, file_name); break;
        case 3: Sorting (file, file_name); break;
        case 4: Search (file, file_name); break;
        case 5: std::cout<<endl<<"  The End! :) "<<endl; break;
        }

    }

    std::cin.sync();
    std::cin.get();

    return 0;
}