怎么改，才能实现，用户输入 reverse void and null,程序输出null and void

#include 

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

  for (i = 2; i < argc; i++)
    printf("%s ", argv[i]);
  printf("\n");

  return 0;
}

for(i=argc-1;i>1;i--)
  printf("%s ",argv[i]);