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Update math/magic_number.cpp

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Co-authored-by: David Leal <halfpacho@gmail.com>
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Neha Hasija 2020-10-19 01:42:47 +05:30 committed by GitHub
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math/magic_number.cpp
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* A number is said to be a magic number, if the sum of its digits are calculated
* till a single digit recursively by adding the sum of the digits after every addition.
* If the single digit comes out to be 1,then the number is a magic number.
* @detail This is a shortcut method to verify Magic Number.
*
* This is a shortcut method to verify Magic Number.
* On dividing the input by 9, if the remainder is 1 then the number is a magic number else not.
* The divisibility rule of 9 says that a number is divisible by 9 if the sum of its digits
* are also divisible by 9. Therefore, if a number is divisible by 9, then, recursively,