file_demo_02

#include "stdafx.h"

int _tmain(void)
{
    size_t n;
    int *massiv_p;
    FILE *demo_file;

    puts("Enter number of elements:");
    scanf_s("%d", &n);
    massiv_p = (int *)calloc(n, sizeof(int));
    if (massiv_p==NULL)
    {
        fprintf_s(stderr, "Error memory allocation: %d", errno);
        return errno;
    }
    for (size_t i = 0; i < n; i++)
    {
        massiv_p[i] = 2 * i + 1;
    }

    errno_t err_code = fopen_s(&demo_file, "C:\\abc\\demofile02.bin","wb");
    //comma separeted value ->;
    if (err_code)
    {
        fprintf_s(stderr, "Error file opening: %d", errno);
        return errno;
    }

    fwrite(massiv_p, sizeof(int), n, demo_file);
    fclose(demo_file);

    err_code = fopen_s(&demo_file, "C:\\abc\\demofile02.bin", "rb");
    //comma separeted value ->;
    if (err_code)
    {
        fprintf_s(stderr, "Error file opening: %d", errno);
        return errno;
    }
    fseek(demo_file, 10 * sizeof(int), SEEK_SET);
    fread_s(massiv_p, sizeof(int)*n, sizeof(int), n - 10,demo_file);
    fclose(demo_file);
    puts("File C:\\abc\\demofile02.txt was written succefully!\n");
}