人们对数学的加减运算可轻易在脑中辨识符号并理解其结果，但电脑做任何事都受限于实体资料储存及操作方式，换言之，电脑硬体实际只认得 0 和 1，却不知道符号 + 和 - 在数学及应用场域的意义，於是工程人员引入「补数」以便在二进位系统中，表达人们认知上的正负数。但您有没有想过，为何「二补数」(2’s complement) 被电脑广泛采用呢？背後的设计考量又是什麽？本文尝试从数学观点去解读编码背後的原理，并佐以资讯安全及程式码最佳化的考量，探讨二补数这样的编码对于程式设计有何关键影响。

The year 2022 marks seven years since the stable version of the Rust language was officially released. Since its release, Rust has been popular among developers. In a Stack Overflow poll of over 73,000 developers from 180 countries, Rust was voted the most popular programming language for the seventh consecutive year, with 87% of developers expressing a desire to use it.

教学影片：Git 中文教学