Create 258. Add Digits.md

2024-09-02 14:20:01 +00:00 · 2018-09-29 23:49:30 +08:00 · 2018-09-29 23:49:30 +08:00 · ee45883d22
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+# [258. Add Digits](https://leetcode.com/problems/add-digits/description/)
+# 思路
+没什么好说的，按照题目的意思，用两个while循环即可。
+# C++
+```
+class Solution {
+public:
+    int addDigits(int num) {
+        int res = 0;
+        while(num >= 10){
+            while(num > 0){
+                res += (num % 10);
+                num /= 10;
+            }
+            num = res;
+            res = 0;
+        }
+        return num;
+    }
+};
+```