258

src/258.c

@@ -1,15 +1,16 @@
-//
-// Created by xfj12 on 2025/3/24.
-//
+#include <solution/258.h>
+
 int addDigits(int num)
 {
-    int total = 0;
     do
     {
-
-    } while ();
-}
-
-int main()
-{
+        int n = 0;
+        while (num)
+        {
+            n += num % 10;
+            num /= 10;
+        }
+        num = n;
+    } while (num >= 10);
+    return num;
 }