vault backup: 2026-01-24 16:40:12

.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",

Collection/连~都忘记了的小知识.md

@@ -25,3 +25,6 @@ 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）
+- 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`a *= 5+8 ==> a = a * (5 + 8)`，赋值运算符的优先级很低
+-