Sum of Nodes in BST

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 In order to get the sum of nodes of binary tree,  add the value of the root node, and move to the left subtree and right subtree, if root have reached to the end, i.e. after root->left=0, root will store 0, in that case return 0.

long int sumBT(Node* root)
{
    if (root==0)
    return 0;
    else 
    return root->key+sumBT(root->right)+sumBT(root->left);
}

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