diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index a786ebb..b31b7fb 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -29,11 +29,25 @@
               "type": "webviewer",
               "state": {
                 "url": "https://share.note.youdao.com/ynoteshare/index.html?id=a66c778ce8c6e4ee03608e493e59ba7a&type=notebook&_time=1768473840238#/WEB4f51ebc698a96e5cc1a682b2fb7b683d",
-                "title": "02C语言",
+                "title": "CQ2605",
                 "mode": "webview"
               },
               "icon": "globe-2",
-              "title": "02C语言"
+              "title": "CQ2605"
+            }
+          },
+          {
+            "id": "187fab6e2e98dad6",
+            "type": "leaf",
+            "state": {
+              "type": "webviewer",
+              "state": {
+                "url": "https://share.note.youdao.com/ynoteshare/index.html?id=a66c778ce8c6e4ee03608e493e59ba7a&type=notebook&_time=1768473840238#/WEB5c35414ed043f2b383d52a7ee225b9ac",
+                "title": "CQ2605",
+                "mode": "webview"
+              },
+              "icon": "globe-2",
+              "title": "CQ2605"
             }
           },
           {
@@ -51,7 +65,8 @@
               "title": "2-4"
             }
           }
-        ]
+        ],
+        "currentTab": 3
       }
     ],
     "direction": "vertical"
@@ -118,13 +133,13 @@
             "state": {
               "type": "outline",
               "state": {
-                "file": "YueQian/相关网站.md",
+                "file": "YueQian/Homework/2-4.md",
                 "followCursor": true,
                 "showSearch": false,
                 "searchQuery": ""
               },
               "icon": "lucide-list",
-              "title": "相关网站 的大纲"
+              "title": "2-4 的大纲"
             }
           },
           {
@@ -234,7 +249,7 @@
             }
           }
         ],
-        "currentTab": 3
+        "currentTab": 2
       },
       {
         "id": "bf1e7d1a52b4651c",
@@ -275,10 +290,11 @@
       "remotely-save:Remotely Save": false
     }
   },
-  "active": "e0e88d3f2dd6fbc1",
+  "active": "add960c244d7897d",
   "lastOpenFiles": [
     "YueQian/Homework/2-4.md",
     "YueQian/相关网站.md",
+    "Diary/2026-2/2026-2-5 周四.md",
     "Diary/2026-2/2026-2-4 周三.md",
     "YueQian/Homework/~WRL0001.tmp",
     "YueQian/Homework/~WRD0000.tmp",
@@ -315,7 +331,6 @@
     "Diary/2026-1/2026-1-28 周三.md",
     "Excalidraw/Drawing 20260122.md",
     "Diary/2026-1/2026-1-27 周二.md",
-    "Diary/2026-1/2026-1-26 周一.md",
     "Excalidraw/Untitled.canvas",
     "Article/Studyroad/vivado_ip_img/IPCore10.png",
     "Article/Studyroad/vivado_ip_img/IPCore07.png",
diff --git a/YueQian/Homework/2-4.md b/YueQian/Homework/2-4.md
index d125f98..879b01d 100644
--- a/YueQian/Homework/2-4.md
+++ b/YueQian/Homework/2-4.md
@@ -1,9 +1,15 @@
 ---
 tags:
-  - empty
+  - 作业
+  - C语言
 aliases: empty
 日期: 2026/2/4
 ---
+# 2-4作业
+
+## 定义一个长度为20的整型数据生成随机数对这个数组进行初始化，编写排序函数对这个数据中的数据进行从小到大排序
+- 要求编写五种排序函数：冒泡排序、选择排序、插入排序、快速排序、希尔排序
+- 提示：[排序算法参考](https://www.cnblogs.com/onepixel/p/7674659.html)
 ```c
 
 #include <stdio.h>
@@ -58,8 +64,6 @@ void selection_sort(int *arr, int len)
     }
 }
 
-  
-
 void quick_sort(int *arr, int left, int right)
 {
     if (left > right)
@@ -104,4 +108,16 @@ int main(int argc, char const *argv[])
     printf("\n");
     return 0;
 }
+```
+## 制作一个图书管理系统，要求：
+1. 输入1：增加书籍名称（可以连续添加多本）
+2. 输入2：删除数书籍名称（删除一本或全部删除）
+3. 输入3：修改书籍名称
+4. 输入4：查找书籍名称（模糊查找或精确查找）
+5. 输入5：显示所有书籍
+6. 输入0：退出系统
+只要系统未退出则可以继续重复进行，直至系统退出。  
+**提示：**`char *book_name[1000]; `// 表示表示最多可存放1000书，书名的长度自己设计。
+```c
+
 ```
\ No newline at end of file