Postorder traversal of a binary tree

struct NODE

{

struct NODE *left;

int value;     /* can take any data type */

struct NODE *right;

};

postorder(struct NODE *curr)

{

if(curr->left != NULL) postorder(curr->left);

if(curr->right != NULL) postorder(curr->right);

printf("%d", curr->value);

}

In a preorder traversal, first (pre) the root is visited and then the left & right sub- trees are traversed. In a postorder traversal, first the left sub-tree is visited, followed by right sub-tree which is then followed through root. In inorder traversal, first the left sub- tree is visited, followed by root, followed by right sub-tree.