Calculator

Practice about Principles of Compiler. 基于一个有穷自动机的简易计算器,然而主要的参考资料是 Head Firsts 设计模式。

因为龙书看不懂

Reference

• Head First Design Pattern
• The picture below:

---The Statechart Diagram---

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---How the State and Calculator interacts---

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---Interface and implements---