本文件包含了高斯列主元消去法，拉格朗日插值多项式，牛顿插值多项式，龙贝格求积分法，牛顿迭代法等C/C++代码。-This document contains out PCA Gaussian elimination method, Lagrange interpolation polynomial, Newton interpolation polynomial, Romberg quadrature, Newton iterative method such as C/C++ code.