https://blog.youkuaiyun.com/linlin1023zh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/linlin1023/article/details/5873357https://blog.youkuaiyun.com/linlin1023/article/details/5873357linlin1023Thu, 09 Sep 2010 14:30:00 +0800主要用于多任务环境中，一个可重入的函数简单来说就是可以被中断的函数，也就是说，可以在这个函数执行的任何时刻中断它，转入OS调度下去执行另外一段代码，而返回控制时不会出现什么错误；而不可重入的函数由于使用了一些系统资源，比如全局变量区，中断向量表等，所以它如果被中断的话，可能会出现问题，这类函数是不能运行在多任务环境下的。
也可以这样理解，重入即表示重复进入，首先它意味着这个函数可以被中断，其次意味着它除了使用自己栈上的变量以外不依赖于任何环境（包括static），这样的函数就是pure]]>https://blog.youkuaiyun.com/linlin1023/article/details/5873318https://blog.youkuaiyun.com/linlin1023/article/details/5873318linlin1023Thu, 09 Sep 2010 14:22:00 +0800C语言程序可以看成由一系列外部对象构成，这些外部对象可能是变量或函数。而内部变量是指定义在函数内部的函数参数及变量。外部变量定义在函数之外，因此可以在许多函数中使用。由于C语言不允许在一个函数中定义其它函数，因此函数本身只能是“外部的”。
       由于C语言代码是以文件为单位来组织的，在一个源程序所有源文件中，一个外部变量或函数只能在某个文件中定义一次，而其它文件可以通过extern声明来访问它（定义外部变量或函数的源文件中也可以包含对该外部变量的extern声明）。
]]>https://blog.youkuaiyun.com/linlin1023/article/details/5830647https://blog.youkuaiyun.com/linlin1023/article/details/5830647linlin1023Sun, 22 Aug 2010 21:44:00 +0800https://blog.youkuaiyun.com/linlin1023/article/details/5735696https://blog.youkuaiyun.com/linlin1023/article/details/5735696linlin1023Wed, 14 Jul 2010 22:39:00 +0800>>" 或直接prompt $g$g$g或者打开注册表，进入HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/Session Manager/Environment，把右边的PROMPT(REG_EXPAND_SZ)更改为$g$]]>https://blog.youkuaiyun.com/linlin1023/article/details/5705614https://blog.youkuaiyun.com/linlin1023/article/details/5705614linlin1023Wed, 30 Jun 2010 21:42:00 +0800https://blog.youkuaiyun.com/linlin1023/article/details/5705605https://blog.youkuaiyun.com/linlin1023/article/details/5705605linlin1023Wed, 30 Jun 2010 21:38:00 +0800/*
 *功能：proc的动态游标操作
 *源文件：dyn_cursor.pc
 */
 
#include
#include
#include
/*#define SQLCA_NONE*/
EXEC SQL INCLUDE SQLCA;
EXEC SQL BEGIN DECLARE SECTION;
    char db_na]]>https://blog.youkuaiyun.com/linlin1023/article/details/5705600https://blog.youkuaiyun.com/linlin1023/article/details/5705600linlin1023Wed, 30 Jun 2010 21:37:00 +0800/*
 *功能：proc动态插入操作
 *源文件：dyn_insert.pc
 */
 
include
#include
#include
/*#define SQLCA_NONE*/
EXEC SQL INCLUDE SQLCA;
EXEC SQL BEGIN DECLARE SECTION;
    char db_na]]>https://blog.youkuaiyun.com/linlin1023/article/details/5705595https://blog.youkuaiyun.com/linlin1023/article/details/5705595linlin1023Wed, 30 Jun 2010 21:33:00 +0800/*
 *功能：proc调用存储过程
 *源文件：procedure.pc
 */
 
#include
#include
#include
/*#define SQLCA_NONE*/
EXEC SQL INCLUDE SQLCA;
EXEC SQL BEGIN DECLARE SECTION;
    char db_name]]>https://blog.youkuaiyun.com/linlin1023/article/details/5705588https://blog.youkuaiyun.com/linlin1023/article/details/5705588linlin1023Wed, 30 Jun 2010 21:30:00 +0800/*
 *功能：proc的游标操作
 *源文件：cursor.pc
 */
 
#include
#include
#include
EXEC SQL INCLUDE SQLCA;
/*#define SQLCA_NONE
  static struct sqlca sqlca;
*/
int  main()
]]>https://blog.youkuaiyun.com/linlin1023/article/details/5687501https://blog.youkuaiyun.com/linlin1023/article/details/5687501linlin1023Tue, 22 Jun 2010 21:23:00 +0800/*
 *功能：proc的update操作
 *源文件：update.pc
 */
#include
#include
#include
EXEC SQL INCLUDE SQLCA;
EXEC SQL BEGIN DECLARE SECTION;
    char db_name[25] = "dbname";
EXEC SQL END ]]>https://blog.youkuaiyun.com/linlin1023/article/details/5687471https://blog.youkuaiyun.com/linlin1023/article/details/5687471linlin1023Tue, 22 Jun 2010 21:12:00 +0800https://blog.youkuaiyun.com/linlin1023/article/details/5682183https://blog.youkuaiyun.com/linlin1023/article/details/5682183linlin1023Sun, 20 Jun 2010 20:40:00 +0800https://blog.youkuaiyun.com/linlin1023/article/details/5682164https://blog.youkuaiyun.com/linlin1023/article/details/5682164linlin1023Sun, 20 Jun 2010 20:28:00 +0800https://blog.youkuaiyun.com/linlin1023/article/details/5681399https://blog.youkuaiyun.com/linlin1023/article/details/5681399linlin1023Sun, 20 Jun 2010 11:31:00 +0800https://blog.youkuaiyun.com/linlin1023/article/details/5633138https://blog.youkuaiyun.com/linlin1023/article/details/5633138linlin1023Sat, 29 May 2010 16:07:00 +0800https://blog.youkuaiyun.com/linlin1023/article/details/5616240https://blog.youkuaiyun.com/linlin1023/article/details/5616240linlin1023Sat, 22 May 2010 13:37:00 +0800https://blog.youkuaiyun.com/linlin1023/article/details/5596245https://blog.youkuaiyun.com/linlin1023/article/details/5596245linlin1023Sat, 15 May 2010 22:43:00 +0800https://blog.youkuaiyun.com/linlin1023/article/details/5595699https://blog.youkuaiyun.com/linlin1023/article/details/5595699linlin1023Sat, 15 May 2010 17:45:00 +0800https://blog.youkuaiyun.com/linlin1023/article/details/5595668https://blog.youkuaiyun.com/linlin1023/article/details/5595668linlin1023Sat, 15 May 2010 17:30:00 +0800https://blog.youkuaiyun.com/linlin1023/article/details/5572897https://blog.youkuaiyun.com/linlin1023/article/details/5572897linlin1023Sun, 09 May 2010 21:49:00 +0800