这是一个积分计算器，能根据输入的函数进行梯形积分，辛普森积分和高斯积分。并且能够对所求结果进行绘图。不是源代码，是成型的软件样板。亲供参考~-This is a points calculator, enter the function according to trapezoidal integration, Simpson' s rule and Gaussian integral. And can the results of the drawing to the request.