struct and define problem

hurry up · 03-19-2003

what the meaning of the first 2 lines?

#define NodePtr struct Node*
typedef NodePtr List;

struct Node
{
ElementType data;
NodePtr next;
};

**Dave_Sinkula** · 03-19-2003

Using [code] [/code] tags presents code in a more appealing way.

Code:

#define NodePtr struct Node*
typedef NodePtr List;

struct Node
{
   ElementType data;
   NodePtr next;
};

Regarding the #define, after preprocessing, the above code would be as follows.

Code:

typedef struct Node* List;

struct Node
{
ElementType data;
struct Node* next;
};

The typedef creates a synonym for the type specified. So with the above code, you could later declare something like the following.

Code:

{
    struct Node node;
    List list = &node;
}

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