Total Non-Leaf Nodes in Tree

-
 int countNonLeafNodes(Node* root)
{
    if(root==0)
    return 0;
    else if(root->right==0 && root->left==0)
    return 0;
    else
    return 1+countNonLeafNodes(root->left)+countNonLeafNodes(root->right);
}

The total number or non leaf nodes will be equal to:
left-subtree + root(1) + right subtree
if left subtree have no child, i.e. left subtree->left==0 and left-subtree->right==0, then return 0.
if right subtree have no child, i.e. right subtree->left==0 and right-subtree->right==0, then return 0.

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