Function to calculate the sum of all elements of a binary tree

static int sumOfAllBinaryTreeElements(treeNode *rootNode) {

	if (rootNode == NULL)
		return 0;
	else
		return sumOfAllBinaryTreeElements(rootNode->leftChild) + rootNode->val
				+ sumOfAllBinaryTreeElements(rootNode->rightChild);

}

above mention function is member function of my Tree ADT class you can check complete program here

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