This is an example of some C code that is perfectly commented and formated. There is even a Python script to format correctly the C code!
The perfectly commented and formated C code given as an example is here.
Have look, you will be amazed how easly understandable a correctly commented and formated C code is!
You can try to execute the example code by doing make, then ./program 100.
See? The output is as expected!
./format.py < some_badly_formated_code.c > perfectly_formated_code.c