hi every one
i was watching tutorials on YouTube and one of them mentioned there is something called functions documentations that helps you to read about the class functions and what it do ( like the string class and i guess the math and files ets).
does any one know how to access these documentation or where to find it ??
Many thanks

If I understand you right, I think these are what you are looking for:

http://www.cplusplus.com/reference/
http://en.cppreference.com/w/
http://msdn.microsoft.com/en-us/library/3bstk3k5.aspx

http://www.cplusplus.com/reference/
http://en.cppreference.com/w/
http://en.cppreference.com/w/cpp/header

Examples:

std::string
http://www.cplusplus.com/reference/string/string/
http://en.cppreference.com/w/cpp/string/basic_string

cmath header:
http://www.cplusplus.com/reference/cmath/
http://en.cppreference.com/w/cpp/header/cmath

Many thanks for all