如何肯定个人pi计算是否准确？ - How do I determine whether my calculation of pi is accurate?

问题：

I was trying various methods to implement a program that gives the digits of pi sequentially. 我正在尝试各类方法来实现一个顺序给出pi数字的程序。 I tried the Taylor series method, but it proved to converge extremely slowly (when I compared my result with the online values after some time). 我尝试了泰勒系列方法，但事实证实它收敛得很是慢（当我在一段时间后将个人结果与在线值进行比较时）。 Anyway, I am trying better algorithms. 不管如何，我正在尝试更好的算法。

So, while writing the program I got stuck on a problem, as with all algorithms: How do I know that the n digits that I've calculated are accurate? 所以，在编写程序时，我遇到了问题，就像全部算法同样：我怎么知道我计算的n位数是准确的？

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解决方案：

参考一： https://stackoom.com/question/xvjK/如何肯定个人pi计算是否准确
参考二： https://oldbug.net/q/xvjK/How-do-I-determine-whether-my-calculation-of-pi-is-accurate