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I'm trying to implement tree algorithms in C. I have declared a extern struct in a header file that is completely independent (b_tree_ds.h). Now I plan to import the file in all source files that want to use this struct. So I must declare it using extern in header. Now the problem is thhat I want to define its typedef as well. the compiler gives error of multiple storage classes. How should I do that. typedef extern struct node { struct node* left; struct node* right; int key; // contains value }NODE; The actual problem is as follow, which I still can't fix??? I recently learnt how can we use multiple source files with header files to make code portable and hierarchical. In order to do so, I tired creating my tree program using this principal. Here are my files b_tree_ds.h - This will contain a declaration of datastructure of node of a tree, which can be called to various functions implementing different functionality of the tree (which may be in different source files) typedef struct node { struct node* left; struct node* right; int key; // contains value }NODE; When i try adding a extern as in typedef extern struct node it gives a error of multiple storage class but if I miss it, I get error for multiple definitions. Here are my other source files traverse.h - contains declaration of traverse function void traverse_print (NODE* p); Here also I get error for unknown identifier NODE traverse.c - contains definition to that function #include <stdio.h> #include "b_tree_ds.h" #include "traverse.h" void traverse_print(NODE* p) { if(p->left != NULL) { traverse_print(p->left); } if (p->right != NULL) { traverse_print(p->right); } printf ("\n%d",p->key); } Finally main.c <

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