Hi.

I'm working on a project for a class, and there's one part of the project that is confusing me.

It's a compression and decompression project, and after we write our code for compression, we need to write to standard error.
(1) Size of original file (number of characters read from standard input)
(2) size of compressed file (number of characters written to standard output)
(3) compression ratio: (orig file size - compressed file size) / original file size.

Now, in my code, I've already determined the size of the original file.
And I'm pretty sure I can figure out how to find the size of the compressed file.
And the compression ratio, then from those two values, are quite obvious.
Is this all that I need?

However, the project says to write to STANDARD ERROR.
What does that exactly mean? I've tried to google it, but I still don't understand.

Could anybody please bring some light into this situation? Thanks so much...