Take command-line arguments and make them reverse output

argv_stack.c

#include <stdio.h>

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

  if (argc >= 1)
    num = argc;

  char* stack[num];
  char** sp = NULL;

  int i;
  for (i = 0; i < num; i++)
  {
    stack[i] = argv[i];
  }
  i--;

  while (num--)
  {
    sp = &(stack[i]);
    printf ("argument %d: %p %s\n", i, *sp, *sp);
    i--;
  }

  return 0;
}