起初，我写了一个功能性编程语言，但在文章中，我使用的是模块化的算术计算器。
Initially, I wrote a functional programming language, but in the article, I am using a modular arithmetic calculator.
（我的论述）涉及一些数字，但我将只运用最基本的算术，任何有计算器的人都可以重新推算一番。
There are some figures involved, but I'll use only the most basic arithmetic, which anyone with a calculator can reproduce.
使用迄今为止学到的东西，现在能够构建简单的计算器来计算算术表达式，如清单9所示。
Using what you have learned so far, you could now build a simple calculator to evaluate arithmetic expressions as shown in Listing 9.
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