How does this self outputting C program works?

Question

here is the smallest code that output itself. But can't grasp how this works. can somebody explain?

main(a){printf(a,34,a="main(a){printf(a,34,a=%c%s%c,34);}",34);}

Answer 1

I bet it won't work on a 64-bit platform unless its model is ILP64 (64-bit ints), because it relies on int being big enough to contain a char*.

It declares a variable a that contains a copy of the code minus the string itself, and uses printf()'s formatting codes to output both the code and the string. Do you need more details?