How to set the font size in Emacs?

Question

I also want to save the font size in my .emacs file.

Answer 1

Here's a snippet that lets you directly specify the global font size using an interactive function:

(defun set-font-size ()
    "Set the font size."
  (interactive)
  (set-face-attribute
   'default nil :height
   (string-to-number
    (read-string "Font size: " (number-to-string (face-attribute 'default :height nil))))))