我惊了，C++ 居然没有定义π，这也太不讲究了吧
@lilythepooh
好像有啊https://www.zhihu.com/question/377168924
@acer 谢谢你！不过这个是C++20出的新属性，不确定各个平台已经追上这个更新了。大概再过半年一年就可以安心使用了？
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@lilythepooh
好像有啊
https://www.zhihu.com/question/377168924