Change Emacs Default Coding System

Question

My problem stems from Emacs inserting the coding system headers into source files containing non-ascii characters:

# -*- coding: utf-8 -*-

My c

Answer 1

Update: I must admit, that I overlooked your actual question concerning the insertion of the variables, so I only answered the "howto setup UTF-8 part", sorry about this. Concerning your actual question I have nothing to add, normally emacs doesn't do this.

maybe this blog entry helps you. Reading the documentation of coding-system-for-read and coding-system-for-write doesn't suggest that you should use it:

coding-system-for-write is a variable defined in `C source code'.
Its value is nil

Documentation:
Specify the coding system for write operations.
Programs bind this variable with `let', but you should not set it globally.
...