C99标准文档，通过非常规途径得到，详细阐述了C99对C语言的各种改进，在实际项目中的个别细节可能需要查阅此官方文档-C99 standard document, obtained by unconventional means, the amount of very valuable documents.

c#编写程序的时候，经常需要用的项目根目录。自己总结如下。 -c# programming, often need to use the project root directory, they are summarized below.