"Steven D'Aprano" <st...@pearwood.info> wrote
(We can of course do some fancy math to speed this particular
sum up since the result for any power of ten has a common pattern,
but I wouldn't expect the compiler optimiser to be that clever)
No fancy maths needed,
The sum of 1,2,3,4,...,N is given by a simple formula: 1/2*N*(N+1).
Depends how you define fancy... I count that as pretty fancy maths
for a compiler optimiser to recognise! :-)
anecdote about the great mathematician Carl Gauss
I like it! I hadn't come across that one before.
Alan G.
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