计算指定位数的圆周率的C++程序，输入位数，计算的圆周率就可以输出到文件中，还有计时。-Calculation of pi-digit designation of the C++ program, enter the median, calculated pi can be output to a file, as well as time.

求派的几种形式，做到精度与图形的结合，其中用到一些适合他人学习的语句。-Seeking to send several forms, so that combined with the precision and graphics, which uses some of the statements for others to learn.

利用GUIDE编写探讨π精度的程序，老师的例子，对于学习GUIDE很有帮助。-Written by GUIDE on the accuracy of PI program, the teacher s example, very helpful for learning GUIDE.