使用数组的步骤建立一颗二叉树

说明：使用数组的方法建立一颗二叉树

例如有一个数组 int p[7] = { 0, 1, 2, 3, 4, 5, 6 };那么如何把这个数组建立成一颗二叉树呢？请看下面的代码。

/***************************************************************************
*	@file:		main.cpp
*	@author:	ugly_chen
*	@date:		2015.1.3
*	@remark:    this code is for binary tree with array
*	@note
****************************************************************************/

#include<iostream>

using namespace std;


struct binary_tree_node
{
	int data;
	binary_tree_node* left_child;
	binary_tree_node* right_child;
};

void create_tree(binary_tree_node* &tree, int a[], int len, int index)
{
	if (index >= len)
		return;
	tree = new binary_tree_node;
	tree->data = a[index];
	tree->left_child = NULL;
	tree->right_child = NULL;
	create_tree(tree->left_child, a, len, 2 * index + 1);
	create_tree(tree->right_child, a, len, 2 * index + 2);
}

void Print(binary_tree_node* p)
{
	if (NULL == p)
		return;
	cout << p->data;
	Print(p->left_child);
	Print(p->right_child);
}

int main()
{
	int p[7] = { 0, 1, 2, 3, 4, 5, 6 };
	binary_tree_node*tree;
	create_tree(tree, p, 7, 0);
	Print(tree);
	return 0;
}