拉格郎日插值多项式,高斯-赛德尔迭代法,改进欧拉法（Ｃ＋＋），如果有什么错误，请联系tudaoyong456@163.com-Lagrange polynomial interpolation, Gauss - Seidel iterative method to improve Euler (C + +), If there is anything wrong, please contact tudaoyong456@163.com

用Visual C++实现的高斯—赛德尔迭代法 很好用的(With Visual c + + implementation of gauss - seidel iterative method is very useful)