Unicode Input in Emacs

One question that had been bugging me for a while is, how does one
input a character in Emacs, given its Unicode hex code?

Answer: use the ucs input method, then use
uHHHH to input, where HHHH is the character’s
hex code.

Unfortunately, it doesn’t look as though there’s a way to input a
character by its decimal code.

Also, C- toggles an input method on and off, rather than
cycling through a list. So if you’re writing HTML (and therefore want
the default input method) with French text (for which you want the
latin-1-postfix input method), but need to insert box-drawing
characters (for which you need ucs), you’ll wind up using
M-x set-input-method a lot.

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