# 有限狀態機

參考資料:(<https://zh.wikipedia.org/wiki/%E6%9C%89%E9%99%90%E7%8A%B6%E6%80%81%E6%9C%BA>)

有限狀態機 FSM (finite-state machine)

表示有限個**狀態**，以及這些狀態之間的 **轉移、動作等行為**的數學模型。

## 狀態和術語

**狀態**儲存關於過去的資訊，就是說：它反映從系統開始到現在時刻的輸入變化。 **轉移**指示狀態變更，並且用必須滿足確使轉移發生的條件來描述它。 **動作**是在給定時刻要進行的活動的描述。有多種類型的動作：

**進入動作**（entry action）：在進入狀態時進行 **退出動作**：在退出狀態時進行 **輸入動作**：依賴於目前狀態和輸入條件進行 **轉移動作**：在進行特定轉移時進行


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