Re: distance from Easter Island to Chile

[Barry Margolin]

In article <87mwfguasr.fsf@nl106-137-194.student.uu.se>,
 Emanuel Berg <embe8573@student.uu.se> wrote:

> (defun distance (l1-r f1-r l2-r f2-r)
>   (interactive)

If you declare this interactive, you need to provide a specification 
string for the arguments, so that it can prompt for them.

And your argument names are not very helpful. They're apparently 
latitude and longitude, so what does "f" mean? And what is the "-r" 
suffix on all of them?

-- 
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
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