What is the purpose of features.h header?

Question

What is the purpose of the features.h header? Why and when can it be used in my code?

Does it define source features supported by the system? Or does i

Answer 1

In general if you need to use any of the variables or functions defined in a header file, you need to include it in your program. This rule is valid for features.h also. You can see a URL for features.h for your reference below:

http://repo-genesis3.cbi.utsa.edu/crossref/heccer/usr/include/features.h.html