我们可以在C源程序中插入传给编译程序的各中指令，这些指令被称为预处理器指令，它们扩充了程序设计的环境。现把常用的预处理命令总结进本文档-We can pass the C compiler to insert source of all the instructions that are called preprocessor directives, they expanded the programming environment. Pre-orders are now commonly us