[Tutor] Loop comparison

Alan Gauld alan.gauld at btinternet.com
Sat Apr 17 01:40:39 CEST 2010

"Steven D'Aprano" <steve at 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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