C Programming-Write an Efficient Method Check if a Number is Multiple of 3 -If sum of digits in a number is multiple of 3 then number is multiple of 3 e.g.,You have to get all decimal digits one by one, add them and then check if sum is multiple of 3.
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C programming for Write an Efficient Method to Check if a Number is Multiple of 3 – Mathematical Algorithms – If sum of digits in a number is multiple of 3.