2.6 C conventions

This specification - which all a user or client of this object needs to see (he isn't interested in the implementation details) - would normally be placed in a file with a .h (h = header) suffix to its name. For the collection, we would place the specifications in files called collection.h and Ucollection.h and use the C #include facility to import them into programs which needed to use them. The implementation or body of the class is placed in a file with a .c suffix.