[Swift] Add Digits
Given a non-negative integer
num, repeatedly add all its digits until the result has only one digit.For example:
Given
num = 38, the process is like: 3 + 8 = 11, 1 + 1 = 2. Since 2 has only one digit, return it.把數字轉成文字然後拆開，遞迴相加後直到剩一個字元
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func addDigits(_ nums: Int) -> Int {
var numsChar = String(nums).characters
while (numsChar.count > 1){
var sum = 0
for char in numsChar {
let intchar = String(char)
sum = sum + Int(intchar)!
}
numsChar = String(sum).characters
}
return Int(String(numsChar))!
}
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