commit 6f4ffd83ec3fddcdf4ede7d7b7c270c18ff675f0
Author: MarioYang <a7275442@gmail.com>
Date:   Thu Apr 24 13:46:11 2025 +0800

    feat: device on/off

diff --git a/1st.cpp b/1st.cpp
new file mode 100644
index 0000000..7c58524
--- /dev/null
+++ b/1st.cpp
@@ -0,0 +1,16 @@
+class Device {
+public:
+    virtual void turnOn() = 0;
+    virtual void turnOff() = 0;
+    virtual ~Device() {}
+};
+
+class LED : public Device {
+public:
+    void turnOn() override {
+        // 點亮 LED
+    }
+    void turnOff() override {
+        // 熄滅 LED
+    }
+};