Anyone of the followings can be used to declare a node for a singly linked list. If we use the first declaration, “struct node * nodePtr;” would be used to declare pointer to a node. If we use the second declaration, “NODEPTR nodePtr;” can be used to declare pointer to a node.
Explanation: The typedef usage is incorrect. Basically, we can’t use yet to be typedef-ed data type inside while applying typedef itself. Here, NODEPTR is yet to be defined (i.e. typedef-ed) and we are using NODEPTR inside the struct itself.
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