#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <iostream.h>

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

   fd = open("matrix", O_WRONLY|O_CREAT|O_TRUNC, 0644);

   n = 1; write(fd, &n, 4);
   n = 2; write(fd, &n, 4);
   n = 3; write(fd, &n, 4);
   n = 4; write(fd, &n, 4);
   n = 5; write(fd, &n, 4);
   n = 6; write(fd, &n, 4);
   n = 7; write(fd, &n, 4);
   n = 8; write(fd, &n, 4);
   n = 9; write(fd, &n, 4);

   close(fd);
}