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代码说明：

说明：  1．编写欧拉前差、后差、梯形公式。 2．编写二阶、三阶龙格库塔法通用程序。 3．编写汉明积分法通用程序. 4．编写用状态转移法对连续系统状态方程进行离散化的通用程序。(1. Euler prepared before the poor, after the poor, trapezoid formula. 2. The preparation of the second order, third-order Runge-Kutta method common procedures. 3. Hamming integration method to prepare common procedures .4. Prepared by the state of the transfer method of continuous system discretization equation of state for the general program.)