#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main()
{
    FILE *fp;
    fp = fopen("liczby3.dat", "w + b");
    srand(time(NULL));
    int i, x, buf;
    for(i = 0; i < 10; i++)
    {
        x = rand() % 20;
        fwrite(&x, sizeof(int), 1, fp);
    }

    while(fread(&buf, sizeof(int), 1, fp))
        printf("%d, ", buf);

    FILE *fp1;
    fp1 = fopen("kopia.dat", "w + b");
    fseek(fp,0,0);

    return 0;
}