说明：  本节给出三个非常实用和高速的内存分配函数。读者可以直接拷贝这三个函数到程序中去，使用Allocate()和My_Free()代替系统提供的alloc()和free()函数。调试环境为TC2.0或者TC3.0
(This section gives three very practical and high-speed memory allocation function. Readers can directly copy these three functions to the processes, the use of Allocate () and My_Free () to replace the system provides alloc () and free () function. Debugging environment TC2.0 or TC3.0)