请教一个结构体程序问题
请问下面的程序是什么意思？谢谢#if !defined(COMMAND_H)
#define COMMAND_H
#include <windows.h>
// The Command Stack Data Structure
struct CommandDS
{
char szElement[81];
};
// The Command Stack Linked List
struct CommandList
{
struct CommandDS Command;
struct CommandList *pNext;
};
// Function Prototypes
struct CommandList *Add_Command(struct CommandList *pNode,struct CommandDS Command);
void Clear_Command(struct CommandList *pStart);
#endif // #define COMMAND_H
