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whoo... ok word size is referring to the 32 and 64 bits.
binary encoding is making a non-negative int using binary.
aka 0 = 32 0's
1 = 000....00001
etc.
BCD is binary-coded decimal. (that's the term you'll wanna google 'cuz i don't recall exactly how it's represented).
so, basically, he wants to know the range of numbers that can be encoded in 32 and 64 bits for each kind of encoding.
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