Write a method that accepts a non-negative integer called 'num'. Return an array of 10 integers such that each element in the array represents a single digit of 'num' with the least-significant digit at the end of the array. The array will always have exactly 10 digits, so leading digits will be zero. Also, as a precondition, you may assume that 'num' will be non-negative and will have no more than 10 digits.