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It is a way to represent values with a balanced number of positive and negative numbers. The primary advantage of XS-3 coding over BCD coding is that a decimal number can be nines' complemented (for subtraction) as easily as a binary number can be ones' complemented; just invert all bits.
Oh, dude, you want the binary code for "boy" in ASCII-7? Like, sure, I could tell you that, but why not just Google it? It's not like I have the entire ASCII table memorized in my brain or anything. But hey, if you're into that kind of stuff, knock yourself out!
Kodam
The sum of binary numbers is also a binary number.
100011 is 35 in binary.