2.2 E2B

Error_code copy_stack(Stack dest, Stack source)

  {Error_code detected=success;Stack temp；
  Stack_entry item;
  while (detected==success  source.empty( ))  
  {detected=source.top(item);
  detected=source.pop( );
  if (detected==success) deteted = temp.push(item);}  
  while (detected==success  temp.empty( ))  
  {detected=temp.top(item); 
  detected=temp.pop( );
  if(detected==success) detected = source.push(item);
  if(detected==success) detected = dest.push(item);}

  return detected；

};