This is one of the most famous interview questions
One of the famous C programs is...
So how does it work?
It's not difficult to understand this program. In the following statement,
the parameter "f" not only acts as the format string, but also as a value for the %s specifier. The ASCII value of double quotes is 34, and that of new-line is 10. With these fact ready, the solution is just a matter of tracing the program.