As I said, if I'm not convincing please go ahead and used signed numbers as I get the popcorn ;)
Here's something you can try: resize a picture (a pure bitmap), with antialiasing, in a very slow machine (think 300MHz VIA x86). Difficulty: without libraries.
Here's something you can try: resize a picture (a pure bitmap), with antialiasing, in a very slow machine (think 300MHz VIA x86). Difficulty: without libraries.