Problem 20. Summing digits

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Solution 112453

Submitted on 14 Jul 2012 by Cris Luengo

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2 Comments

2 Comments

Pasumarthi Viswanath on 11 Nov 2012

please explain why the digits get separated when (num2str(2^n)-'0') is performed

Cris Luengo on 12 Nov 2012

num2str converts the integer number into a string representation of that number: 1234 becomes '1234', which is the same as ['1','2','3','4']. Now you've got one array entry per digit. Subtract '0' from there, then the char array will become a double array with value 0 where the char was '0', etc.

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