龙贝格算法的实现，对初学者有很重要的指导意义。-This program is very useful.

各种数值积分，包括牛顿积分，辛普生各分、龙贝格积分,高斯积分和高斯—勒让德积分-A variety of numerical integration, including Newton integral, sub Simpson, Romberg integration, Gaussian integrals and Gauss- Legendre integration