用Visual C++开发的图形化圆周率Pi计算程序，共有“反正切 级数展开”、“反正弦级数展开”、“Marchin公式”、“Shank s公式”和“Gauss公式”五种方法可供选择。-Using Visual C++ development of graphical Pi pi calculation program, a total of " arctangent series expansion," " arcsine Series" , &quo