12-binary_tree_leaves.c

#include <stdio.h>
#include <stdlib.h>
#include "binary_trees.h"

/**
 * binary_tree_leaves - count the leaves in a binary tree
 *
 * @tree: pointer to the root node of the tree to count the
 * number of leaves
 *
 * Return: the number of leaves in the tree or 0 if @tree is NULL
 */
size_t binary_tree_leaves(const binary_tree_t *tree)
{
	size_t leaves;

	leaves = 0;
	if (!tree)
		return (0);
	if (!tree->left && !tree->right)
		return (1);
	if (tree->left)
		leaves += binary_tree_leaves(tree->left);
	if (tree->right)
		leaves += binary_tree_leaves(tree->right);

	return (leaves);
}