说明：  C/C++是使用ns2的基础。调试的过程中出现的错误大多数都是C/C++常见的错误，比如空指针等等。不要被ns环境吓倒，ns2环境中出现的C/C++问题和在你熟悉的环境中出现的C/C++问题本质上是一样的，解决的方法和思路也基本相同。
(C/C++ is to use the basis of ns2. The process of debugging most of the mistakes in C/C++ common errors, such as null pointers and so on. Ns not to be intimidated by the environment, ns2 emerging environment C/C++ problems and you are familiar with in the emerging environment C/C++ the problem is essentially the same, solutions and ideas are basically the same.)