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What to do with the ASCII key & math?

They have just enough bits to accomodate all ASCII symbols. You can add, subtract, multiply, divide, and % or mod, chars. … For instance, printf("%c", 'a'-' ') should print 'A' each char corisponds to their ASCII number. So before doing that math you first need to convert 'A' or 'a' to 0. I hope that helps. …
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