dsa · easy
Add Digits
Repeatedly replace a non-negative integer num by the sum of its decimal digits until a single digit remains. Return that digit.
Arguments
num— non-negative integer
Example
num = 38 → 3+8=11 → 1+1=2.
Constraints
0 <= num <= 2^31 - 1
Examples
Example 1
Input: 38 Expected: 2
Example 2
Input: 0 Expected: 0