Functions don't come until Ch 8 so, I'd guess that it is just testing that you are using the various segments correctly which is one of the goals of Ch 7.
Yes, it's just for testing segments but it may help to know that, at this stage, all "local 0" means is the memory cell whose address equals the value stored at LCL (Ram[1]) plus the index 0. That's the way local vars will be implemented in the next chapter.
Locked
