#include <iostream>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <fstream>
#include <string>

using namespace std;

int main(int argc, char * argv[]) {

   int fd;
   int flags;
   int i;
   //char c;
   string filename{"output"};

   if (argc > 1) {
      filename = argv[1]; 
   }

   mode_t mode;

   flags = O_WRONLY | O_TRUNC | O_CREAT;
   mode = S_IRUSR | S_IWUSR | S_IROTH | S_IRGRP;

   fd = open(filename.c_str(),flags, mode);

   for(i = 65; i < 75 ; i++) {
      write(fd, &i, sizeof(int));
   //   c = 'a' + i;
   //   write(fd, &c, sizeof(char));
   }

   close(fd);


   return 0;
}