37 wins the Offer-- face questions: Binary Serialization

Interview questions 37: sequence of binary
Title: Implement the two functions, are used to serialize and deserialize binary tree.

#include<iostream>
using namespace std;
struct BinaryTreeNode {
	int value;
	BinaryTreeNode* left;
	BinaryTreeNode* right;
};
// 序列化 
void Serialize(BinaryTreeNode* pRoot, ostream& stream){
	if(pRoot==NULL){
		stream<<"$,";
		return; 
	}
	stream<<pRoot->value<<",";
	Serialize(pRoot->left, stream);
	Serialize(pRoot->right, stream);
}
// 反序列化
void Deserialize(BinaryTreeNode** pRoot, istream& stream){
	int number;
	if(ReadStream(stream, &number)){
		*pRoot=new BinaryTreeNode();
		(*pRoot)->value=number;
		(*pRoot)->left=NULL;
		(*pRoot)->right=NULL;
		
		Deserialize(&((*pRoot)->left), stream);
		Deserialize(&((*pRoot)->right), stream);
	}
} 
int main() {

	return 0;
}