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The most simple way to check for n’s divisibility by 9 is to do n%9.
Another method is to sum the digits of n. If sum of digits is multiple of 9, then n is multiple of 9.
The above methods are not bitwise operators based methods and require use of ‘%’ and ‘/’. The bitwise operators are generally faster than modulo and division operators. Following is a bitwise operator based method to check divisibility by 9..
you can check this also with the example :-
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