go through this links. This will clear you all about function pointers.

1,, http://www.newty.de/fpt/index.html
2, http://www.cprogramming.com/tutorial/function-pointers.html

Hi,
You cannot use try as a function name in c++, because try is a keyword in c++ used for exception handling.
The following code should work.

#include<iostream>
#include<fstream>...