c++文件翻转

代码说明：

Make your rcopy robust against all kinds of user or operation system errors. That means – check all return values for operating system errors (mostly I/O errors) and command line arguments for user errors. Stick to our files and interfaces that we provide via SubVersion. You may add methods (e.g. for file size or reversing the buffers content), but you are not allowed to change the signature of any method specified by us.