自己写的一个计算圆周率的小程序，该方法利用圆周率的莱布尼次公式原理来实现，当前版本可以计算至五位以上，再往下记算可能会由于累积误差，使计不够精确，后续版本会解决这一问题。-To write a small program that calculated pi, pi using the method of Lai Buni second formula works to achieve, the current version can be calculated to five or more, and then note down the accumulated error count may be due, not precise enough to count, follow-up version will solve this problem.