Arduino HIGH LOW

Question

I have an Arduino and I am wondering exactly what HIGH and LOW mean as far as actual values go... Are they signed ints? Unsigned ints? Unsigned chars??? What are their values? I

Answer 1

Have a look at hardware/arduino/cores/arduino/Arduino.h (at least in Arduino 1.0.1 software), lines 18 and 19:

 #define HIGH 0x1
 #define LOW  0x0

Meaning, these defines being hexadecimal integer values, you can do whatever bitwise operations you want with them - how much sense that will make, however, is not really clear to me at the moment. Also bear in mind that these values might be subject to change at a later time - which would make bitwise operations on them even more unwise.