A challenge: how to write a program that outputs its own source code?

A challenge: how to write a program that outputs its own source code? Writing a portable self-regeneration program is difficult, in part because of the difficulty of referencing and character sets.

Here is a classic example (it should be represented in a line, although it is self-repaired after the first execution ):

Char * s = "char * s = % C % S % C; Main () {printf (S, 34, S, 34) ;}"; Main () {printf (S, 34, S, 34 );}

This program has some dependencies, ignoring # include <stdio. h>, and assuming double quotation marks"The value is 34, which is the same as the value in ASCII.

Here is another release of James HU:

# Define Q (k) Main () {return! Puts (# K "/NQ (" # K ")");} Q (# define Q (k) Main () {return! Puts (# K "/NQ (" # K ")");})