It always takes longer than you expect, even when you take into account Hofstadter's Law.
I am doing a startup!
Cross-browser testing from your browser!
I have written my fourth book!
Be faster than Larry Wall in the shell!
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Can someone please provide some examples of why you would want to do things to the nth bit? I don't see what this actually achieves.
How about making an amber and green LED alternately flash on your cool new widget you are building with a microcontroller?
Testing so a robotic control program will know that one of its sensors has tripped. (it has hit the wall, and maybe should reverse for a bit.)
This type of activity is usually reserved for hardware programming / embedded systems. It's what makes your keyboard work with a single chip and an embedded program to convert switch closures into a stream of characters the computer can use as input.
Thanks Mark. So I'm relatively safe in my ignorance of these then - until I start trying to install Linux on my toaster.
A binary word is not just a number. It is also a set: for each possible element value, a 1 tells you it is present, a 0 it is not. A byte can represent days of a week, a 32-bit word is enough for a month. 0x6060c183, shifted and masked, identifies the weekend days in any month.
In C++ std::bitset<> wraps a lot of this stuff in less hacky garb.
(why do I need your e-mail?)
It would be nice if you left your e-mail address. Sometimes I want to send a private message, or just thank for the great comment. Having your e-mail really helps.
I will never ever spam you.
(Your twitter handle, if you have one.)
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Peter Krumins' blog about programming, hacking, software reuse, software ideas, computer security, browserling, google and technology.
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