From 7325a229893ec137fc839948e988975dcc5f947c Mon Sep 17 00:00:00 2001
From: Jeffrey Hsu <xfj12@outlook.com>
Date: Sat, 12 Jul 2025 23:57:21 +0800
Subject: [PATCH] 258

---
 CMakeLists.txt         |  2 --
 include/solution/258.h | 11 +++++++++++
 src/258.c              | 21 +++++++++++----------
 tests/test_258.cpp     | 23 +++++++++++++++++++++++
 4 files changed, 45 insertions(+), 12 deletions(-)
 create mode 100644 include/solution/258.h
 create mode 100644 tests/test_258.cpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 62dfc11..4b30ed4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -60,7 +60,6 @@ add_executable(219 src/219.c)
 add_executable(225 src/225.c)
 add_executable(228 src/228.c)
 add_executable(231 src/231.c)
-add_executable(258 src/258.c)
 add_executable(263 src/263.c)
 add_executable(268 src/268.c)
 add_executable(278 src/278.c)
@@ -96,7 +95,6 @@ set(EXECUTABLE_SOURCES
         "${CMAKE_SOURCE_DIR}/src/225.c"
         "${CMAKE_SOURCE_DIR}/src/228.c"
         "${CMAKE_SOURCE_DIR}/src/231.c"
-        "${CMAKE_SOURCE_DIR}/src/258.c"
         "${CMAKE_SOURCE_DIR}/src/263.c"
         "${CMAKE_SOURCE_DIR}/src/268.c"
         "${CMAKE_SOURCE_DIR}/src/278.c"
diff --git a/include/solution/258.h b/include/solution/258.h
new file mode 100644
index 0000000..eb27809
--- /dev/null
+++ b/include/solution/258.h
@@ -0,0 +1,11 @@
+#ifndef INC_258_H
+#define INC_258_H
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+    int addDigits(int num);
+#ifdef __cplusplus
+}
+#endif
+#endif
\ No newline at end of file
diff --git a/src/258.c b/src/258.c
index 9bd833b..380ad78 100644
--- a/src/258.c
+++ b/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;
 }
diff --git a/tests/test_258.cpp b/tests/test_258.cpp
new file mode 100644
index 0000000..842e82e
--- /dev/null
+++ b/tests/test_258.cpp
@@ -0,0 +1,23 @@
+#include <gtest/gtest.h>
+#include <solution/258.h>
+
+// 测试类定义
+class AddDigitsTest : public ::testing::Test
+{
+};
+
+// 示例 1：输入 38，输出 2
+TEST_F(AddDigitsTest, Example1)
+{
+    int input = 38;
+    int expected = 2;
+    EXPECT_EQ(addDigits(input), expected);
+}
+
+// 示例 2：输入 0，输出 0
+TEST_F(AddDigitsTest, Example2)
+{
+    int input = 0;
+    int expected = 0;
+    EXPECT_EQ(addDigits(input), expected);
+}
\ No newline at end of file