说明：  用Vc++语言实现拉格朗日插值、牛顿插值、 复化Simpson公式、龙贝格公式、牛顿迭代法、高斯列主元消去法、Seidel 迭代法
(Vc++ language with the realization of the Lagrange interpolation, Newton interpolation, Complex formula of Simpson, Romberg formula, Newton iteration, Gauss elimination method out PCA, Seidel iterative method)