结构

/*  方法一  */  
typedef struct tag_1{  
    int value;  
    struct tag_1 *link;    
} NODE;  


/*  方法二  */  
struct tag_2;  
typedef struct tag_2 NODE;  
struct tag_2{  
    int value;  
    NODE *link;      
};  


/*  方法三  */  
struct tag_3{  
    int value;  
    struct tag *link;    
};  
typedef struct tag_3 NODE;

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