文章作者：Tyan
博客：noahsnail.com | CSDN | 简书
1. Description
2. Solution
- Version 1
class Solution {
public:
int addDigits(int num) {
int n = num;
while(n > 9) {
n = calDigits(n);
}
return n;
}
private:
int calDigits(int m) {
int sum = 0;
while(m) {
int r = m % 10;
sum += r;
m = m / 10;
}
return sum;
}
};- Version 2
class Solution {
public:
int addDigits(int num) {
if(num == 0) {
return 0;
}
int res = num % 9;
return res==0?9:res;
}
};