用计算机模拟一个随机事件，蒲丰投针的实验，并估计随机事件发生的概率以计算圆周率pi，并分析所设计的随机实验中各因素的影响。(A computer simulation of random events, such as Buffon needle experiment, and estimate the probability of random events to compute PI, and analyze the influencing factors in the design of