中文说明：孙志忠编写的《偏微分方程数值解法》一书中例题1.1.3的程序。用紧差分格式解常微分方程边值问题。
English Description：
The program of example 1.1.3 in the book numerical solution of partial differential equations written by sun Zhizhong. A compact difference scheme is used to solve boundary value problems of ordinary differential equations.