Data representation
How do we represent "stuff"?
Example: file my.c
%emacs my.c
main () {
   float f = 3.14;
   printf ("%f\n", f);
}
%cc my.c
%a.out
What is the representation of "3.14"?
in my.c: character (ASCII)
in a.out (file or RAM): floating point (IEEE 754 standard)
What is the representation of "\n"?