Just curious why the C++ standard library uses all lower case and underscores instead of camelCase
or PascalCase
naming convention.
Personally, I find the latter much easier to deal with when typing out code, but is there some kind of legitimate reason to use the former?
Main reason : To keep compatibility with the existing code, since they have done it with C also.
Also have a look at these C++ Coding standards, which presents some generic reasoning regarding the importance of convention.
These links discusses about the naming conventions of C/C++ Standard Library.