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Re: Finding sum of all digits from 1 to 1 million.

by flexvault (Monsignor)
on Jan 30, 2013 at 19:32 UTC ( #1016144=note: print w/replies, xml ) Need Help??

in reply to Finding sum of all digits from 1 to 1 million.


I confused by the term 'DECIMAL DIGITS'. In the following sequence, I would count the number of decimal digits as:

100 sum: 3 101 sum: 6 102 sum: 9 ...
In those 3 numbers, we have a total of 9 digits.

So if I use this code:

perl -E '$sum=0;for(1..1e6){$sum+=length($_);} say $sum;'
The result printed as 5888896, which is not 27000001.

So how is the term 'DECIMAL DIGITS' defined? I think that is key to solving for the "real" answer.


"Well done is better than well said." - Benjamin Franklin

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