lab9 pro5

#include <stdio.h>

// reorder command-line args, put all starting with '-' first

void reorder(int argc, char *argv[])
{
  int l = 1, r = argc - 1;
  while (*argv[l] == '-')	// first traversal must check bounds
    if (++l >= r) return;	// ok if only last != '-'
  while (*argv[r] != '-')
    if (--r <= l) return;
  do {
    char *aux = argv[l];	// swap if l < r
    argv[l] = argv[r];
    argv[r] = aux;
    while (*argv[++l] == '-');	// both will stop for sure
    while (*argv[--r] != '-');
  } while (l < r);
}

int main(int argc, char *argv[])
{
  reorder(argc, argv);
  for (int i = 1; i < argc; ++i)
    puts(argv[i]);
  return 0;
}