编写无错代码的最好方法是把防上错误放在第一位。关于这个问题，同样也有许多的技巧。某些技巧与常用的编码惯例有关，但它们不是象“每个人都违背原则”或“没有人违背该原则”这样泛泛地考虑问题，而是对相应的细节进行详细的讨论。-Write error-free code is the best way is to give top priority to prevent errors. On this issue, also there are many skills. Some skills and common coding practices related, but they are not like " everyone is against the principles"　or " no violation of the principle,"　so consider the general problem, but the details of the corresponding detailed discussion.