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The Emacs manual describes how you can customize certain variables on a per-file basis by including a file local variable block at the end of the file (see Local Variables in Files in GNU Emacs Manual).
So far, you’ve only seen a functional interface for setting styles in CC Mode, and this can’t be used here. CC Mode fills the gap by providing two variables for use in a file’s local variable list. Don’t use them anywhere else! These allow you to customize the style on a per-file basis:
Set this variable to a style name string in the Local Variables list.
From now on, when you visit the file, CC Mode will automatically set
the file’s style to this one using c-set-style.
Set this variable (in the Local Variables list) to an association list
of the same format as c-offsets-alist. From now on, when you
visit the file, CC Mode will automatically institute these offsets
using c-set-offset.
Note that file style settings (i.e., c-file-style) are applied
before file offset settings
(i.e., c-file-offsets)23.
If you set any variable by the file local variables mechanism, that
setting takes priority over all other settings, even those in your
mode hooks (see Hooks). Any individual setting of a variable
will override one made through c-file-style or
c-file-offsets.
Also, if either of these are set
in a file’s local variable section, all the style variable values are
made local to that buffer, even if
c-style-variables-are-local-p is nil. Since this
variable is virtually always non-nil anyhow, you’re unlikely to
notice this effect.