What are the considerations for handling large files efficiently with InputStreams?

While statements may start and stop anywhere in the flexible manner popularized by Algol60, most modern programming languages insist that statements finish with an end sign like a semicolon or colon. To the contrary, Python and a handful of other programming languages adhere to a set structure in which statements start in a certain column and stop at the end of a line of code unless continuation marks are provided for each statement. Discover how readability, writability, and security are affected by a file's fixed or free format in the following paragraphs.

How can you implement a custom InputStream for a specific data source or format?

Please name three distinct classes available in C++ that may be used to generate input streams.

Where did the file space's hierarchical structure start?