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i have to write a linked list program in C, in which the number of members within each node itself is variable.The members within node could be of same or different data types. Any ideas would be greatly appreciated...

If you've a finite set of possible node type, then you may define a struct for each node type, and store, in every node both
<ul><li>a pointer of the actual data structure, as <code>void *</code>.</li>
<li>a integer value representing the actual type of the data.</li>

(of course you've also to store a pointer to the next item of the list...)

for instance:
/* data structs, i.e. node types */
typedef struct tagPoint
  int x;
  int y;

typedef struct tagUser
  const char * name;
  int age;
} User;
/*... other data types...*/

typedef enum  TagNodeType
} NodeType;

typedef struct TagListItem
  NodeType nt;
  void * pData;
  struct TagListItem * pNext;
} ListItem;

Then implement a addListItem function accepting a pointer to actual data and a value representing the data type.
On retrieving data you've to check the nt field in order to properly cast the pData pointer.


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Are you talking about a B Tree?
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Actually any concept in C, that could implement this sort of requirement is fine. To simplify let us consider that members within a node can be of same data type for example int. So there can be some members with int and some with integer array.
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