why a return is representable as ^^M in tex?

Asked Jan 22 '17 at 13:54

Active Jan 22 '17 at 13:54

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The texbook says that a return is representable as ^^M, I was wondering why is that, and any help on this will be highly appreciated!

asked Jan 22 '17 at 13:54

Jiapan

2

This is by design that the representation of a character with ^^ the ASCII code differs by 64, in ASCII code CR (return has xD whereas M has x4D which means a difference of 64 then, so actually one has to subtract 64 from the ^^ value to get the 'real' character. -- this is part of the two-level input processing (as it is called in TeX by Topic) – Jan 22 '17 at 14:03

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