工程中很多的地方用到龙格库塔求解微分方程的数值解，龙格库塔是很重要的一种方法，尤其是四阶的，精确度相当的高。此代码只是演示求一个微分方程，要求解其它的微分方程，可以自己定义借口函数，退换程序里面的函数：float f(float , float)即可；-project many places used for Runge - Kutta numerical solution of differential equations. Runge - Kutta is a very important one, especially in four bands, precision is high. This code is only for a demonstration of differential equations, required understanding of the other equation, can be an excuse for its own definition of function, inside were returned to the function : float f (float, float) can be;