From ee45883d2275a5fc2bf7f85ea9a627267386f1ac Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=94=90=E6=A0=91=E6=A3=AE?= <14021051@buaa.edu.cn>
Date: Sat, 29 Sep 2018 23:49:30 +0800
Subject: [PATCH] Create 258. Add Digits.md

---
 258. Add Digits.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 258. Add Digits.md

diff --git a/258. Add Digits.md b/258. Add Digits.md
new file mode 100644
index 0000000..04429d0
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+++ b/258. Add Digits.md	
@@ -0,0 +1,21 @@
+# [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;
+    }
+};
+```