diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 0c4dfbb..918de97 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -81,7 +81,7 @@
             }
           }
         ],
-        "currentTab": 4
+        "currentTab": 1
       }
     ],
     "direction": "vertical"
@@ -148,12 +148,13 @@
             "state": {
               "type": "outline",
               "state": {
+                "file": "Collection/连~都忘记了的小知识.md",
                 "followCursor": true,
                 "showSearch": false,
                 "searchQuery": ""
               },
               "icon": "lucide-list",
-              "title": "大纲"
+              "title": "连~都忘记了的小知识 的大纲"
             }
           },
           {
@@ -305,7 +306,7 @@
       "remotely-save:Remotely Save": false
     }
   },
-  "active": "42e7165f72a639db",
+  "active": "d83368a00da306d8",
   "lastOpenFiles": [
     "YueQian/相关网站.md",
     "Collection/连~都忘记了的小知识.md",
diff --git a/Collection/连~都忘记了的小知识.md b/Collection/连~都忘记了的小知识.md
index 5fa8fac..63deeb3 100644
--- a/Collection/连~都忘记了的小知识.md
+++ b/Collection/连~都忘记了的小知识.md
@@ -24,4 +24,7 @@ chmod +x mount_hgfs #增加执行权限
 mv mount_hgfs /bin #移动到/bin路径下 以后使用 mount_hgfs 直接执行
 ```
 - C语言`&&`运算符的左值为假时，右值不进行计算，同理`||`运算符左值为真右值不进行计算
-- 按位异或`^，a ^ b = c , a ^ c = b , b ^ c = a;`,可用于进行数的交换（省去中间值）
\ No newline at end of file
+- 按位异或`^，a ^ b = c , a ^ c = b , b ^ c = a;`,可用于进行数的交换（省去中间值）
+- C语言左移`<<`就是与2的x次方相乘，右移为相除
+- 简便运算后有括号`data |= 0x03 << 14 ==> data = data | (0x03 << 14)`
+- 
\ No newline at end of file