#include <fstream>
#include <iostream>
#include <cstdlib>
#include <math.h>
const int ci=10; // количество элементов
int main()
{
    std::ofstream fout("file.bin", std::ios::binary);
    if (!fout.is_open()) { std::cout << "COULD NOT OPEN \n"; return 1; }
    for ( int i = 0; i<ci; i++)
    {
        double randvar = rand() - RAND_MAX/2.0;
        fout.write((char*)&randvar,sizeof(randvar));
    }
    fout.close();
    std::ifstream fin("file.bin", std::ios::binary | std::ios::ate);
    if (!fin.is_open()) { std::cout << "COULD NOT OPEN \n"; return 1; }
    int size = fin.tellg();
    fin.seekg (0, std::ios::beg);
    double *mas(NULL);
    mas = new double[size];
    int i(0);
    while(!fin.eof())
    {
        fin.read((char*)&mas[i],sizeof(double));
        std::cout << mas[i] << " | " << i << std::endl;
        i++;
    };
    fin.close();
    int before_sort_last = mas[i-2];
    int before_sort_first = mas[0];
    int max = i-1; // узнаем кол-во элементов из файла, -1 из-за последнего завершающего элемента.
    double odd_big(0), not_odd_big(0), odd_small(0), not_odd_small(0);
    /********************четные, не четные**********************/
    for (int i = 0; i<(max); i++)
    {
        if ((i % 2) == 0)
        {
            if (abs(not_odd_big) < abs(mas[i])) { not_odd_big=mas[i]; } else { if(abs(mas[i]) > abs(not_odd_small)) { not_odd_small=mas[i]; } }
        } else
        {
            if (abs(odd_big) < abs(mas[i])) { odd_big=mas[i]; } else { if(abs(mas[i]) > abs(odd_small)) { odd_small=mas[i]; } }
        }
    }
    std::cout << " ---------- AFTER SORT ------------------ "  << std::endl;
    for (int i=0; i<(max-1);i++)
    {
        for (int j = i+1; j<(max);j++)
        {
            if (mas[i] < mas[j])
            {
                double buf = mas[i];
                mas[i] = mas[j];
                mas[j] = buf;
            }
        }
        std::cout << mas[i] << " | " << i << std::endl;
    }
    std::cout << mas[max-1] << " | " << max-1 << std::endl;
    /************************Вывод*********************************/
    std::cout << "\n OUTPUT: \n Max value of file = " << mas[0] << std::endl
              << " Min value of file = " << mas[max-1] << std::endl
              << " Summ of max and min value of file = " << mas[0] + mas[max-1] << std::endl
              << " Min value of odd number of file = " << odd_small << std::endl
              << " Max value of odd number of file = " << odd_big << std::endl
              << " Min value of not_odd number of file = " << not_odd_small << std::endl
              << " Max value of not_odd number of file = " << not_odd_big << std::endl
              << " Subtraction of first and last = " << before_sort_first << " - " << before_sort_last << " = " << (before_sort_first - before_sort_last) << std::endl;

    delete []mas;
    system("pause");
    return 0;
}