Instructions: You are given a passage. Using the information present in the passage, you need to classify it into one of the 10 topics: 0 - 'Society & Culture', 1 - 'Science & Mathematics', 2 - 'Health', 3 - 'Education & Reference', 4 - 'Computers & Internet', 5 - 'Sports', 6 - 'Business & Finance', 7 - 'Entertainment & Music', 8 - 'Family & Relationships', 9 - 'Politics & Government'.
Input: You can think of POSIX as a runtime standard for C, but for many reasons, some language/operating system providers decide to either not provide a determined function, change its parameters, its name or some criterion on how to handle the request.
If a certain operating system does support the full set of POSIX operations with the standard names, parameters and criteria, then they may certify that with IEEE.
That allows you to create a C program and, as long as you use only POSIX functions, it's bound to work correctly on any POSIX-conformant system.

Hope it helped! Ignacio.--
Output:
4