想像设计工作是创建一个小的命令列计算器：使用者类型(或管道)中，一个数学运算式和计算器进行分析和列印结果。
Imagine the design exercise is to create a small command-line calculator: a user types (or pipes) a mathematical expression in, and the calculator parses it and prints the result.
想像设计工作是创建一个小的命令列计算器：使用者类型(或管道)中，一个数学运算式和计算器进行分析和列印结果。
Imagine the design exercise is to create a small command-line calculator: a user types (or pipes) a mathematical expression in, and the calculator parses it and prints the result.
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