diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 54c9d45..3480aff 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -57,17 +57,17 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "Diary/2026-1/2026-1-23 周五.md",
+                "file": "Collection/连~都忘记了的C语言小知识.md",
                 "mode": "source",
                 "source": false,
                 "backlinks": false
               },
               "icon": "lucide-file",
-              "title": "2026-1-23 周五"
+              "title": "连~都忘记了的C语言小知识"
             }
           }
         ],
-        "currentTab": 2
+        "currentTab": 3
       }
     ],
     "direction": "vertical"
@@ -292,11 +292,11 @@
       "remotely-save:Remotely Save": false
     }
   },
-  "active": "fa1d4d0680240de1",
+  "active": "6bbdb6c9df9a2d8f",
   "lastOpenFiles": [
+    "Diary/2026-1/2026-1-23 周五.md",
     "Collection/连~都忘记了的C语言小知识.md",
     "YueQian/相关网站.md",
-    "Diary/2026-1/2026-1-23 周五.md",
     "README.md",
     "Excalidraw/Drawing 20260122.md",
     "test.md",
diff --git a/Collection/连~都忘记了的C语言小知识.md b/Collection/连~都忘记了的C语言小知识.md
index ed24813..f884398 100644
--- a/Collection/连~都忘记了的C语言小知识.md
+++ b/Collection/连~都忘记了的C语言小知识.md
@@ -4,3 +4,10 @@ tags:
 aliases: empty
 日期: 2026/1/23
 ---
+- 字符转数字要 `-'0'`
+```c
+	char arr[10];
+	for(int i = 0;i < strlen(arr);i++)
+		num = num * 10 + arr[i] - '0';
+```
+- 
\ No newline at end of file