使用C#语言编写的龙贝格积分算法实现定积分的计算，Winform界面，可以在程序中设置被积函数，在界面中输入积分上下限和精度要求即可输出积分结果。-Romberg integration algorithm using C# language to achieve the definite integral calculation, Winform interface, can be set in the program is integrable functions, enter the li