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I would know if it is possible to set C/C++ macros to be a specific color when the files are opened in emacs.

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Why do you link to the Wikipedia article for SANs with the label emacs? – N.N. Mar 4 '12 at 19:12

Put this code in your .emacs startup file:

(require 'font-lock)

(defun my-c-and-c++-mode-hook ()
  "Added to c-mode-hook and c++-mode-hook.  This function runs when you visit
a C or C++ file."
  (set-face-foreground 'font-lock-constant-face "blue")
  (turn-on-font-lock))

(add-hook 'c++-mode-hook 'my-c-and-c++-mode-hook)
(add-hook 'c-mode-hook 'my-c-and-c++-mode-hook)

You can change the color "blue" to a RGB specification, such as "#f88", if you want to get a color that Emacs doesn't have a predefined name for.

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Unfortunately, the face font-lock-constant-face applies to more than just macros. Any numeric literal, such as 123 or 3.14, will appear in that face also. – Fran May 2 '12 at 18:10
    
You could define your own custom face to use in the above code, like this: (set-face-foreground (make-face 'my-macro-face) "blue"). Then change font-lock-constant-face above to my-macro-face. – Fran May 14 '12 at 16:34

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