Well, you've got a good start. Couple of tips: a) use [code] and [/code] tags when you post code, so that formatting is preserved. Makes your code more readable for those trying to help ;)
b)your public boolean trial should not be inside main. Make sure there is a closing brace } for main before you define trial.
c) Since you know you need to have 100 numbers, you could store it simply in an array: int [] theNumbers = new int[100]; . I'd recomment that you familiarize yourself with the ArrayList class though (you'll have to use the Integer wrapper for this).
You should post a little more code if you have a problem. We won't do your homework for you, but we're willing to help you if you have problems. ;)
To be honest, I don't exactly remember how it works. I doubt it uses the 16-bit extender, though, since it's not an I type instruction. I want to say that there's a mux (and probably a 5-to-32 bit extender) between the register file and the ALU, but I really can't remember for sure. I do know that it uses the ALU for the operation though.
The reason cp -r source/*.h is not working is because you've only told it to look at .h files. For that reason, it doesn't copy the child directory (since it's not a .h file itself), much less its contents (though they may be .h files).
