And I'll add for signed and unsigned and this is how I look at them, maybe not a technical definition:
signed and unsigned integers are integers that can be positive and negative. A signed integer of a certain size can go from a certain negative value to a certain positive value, depending on the size of the integer so -n to +n. Now an unsigned integer is only positive and can go from 0 to n. In the case above where you have unsigned and signed in the same 4-byte block, you have say the first 10 bits are signed so the value can go from -2^9 to 2^9-1. And then you have the unsigned piece that can go from 0 to 2^20 -1 since it is 20 bits.
Any help?
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