#include 
    
     #include 
     
      #include 
      
       typedef int datatype;typedef struct _bitree_node_ {	datatype data;	struct _bitree_node_ *lchild;	struct _bitree_node_ *rchild;}bitree;bitree *creat_bitree_node(datatype value){	bitree *root = (bitree *)malloc(sizeof(bitree));	memset(root,0,sizeof(bitree));	root->data = value;	return root;}bitree *creat_bitree(datatype min, datatype max){	bitree *root = creat_bitree_node(min);	if(min * 2 <= max)		root->lchild = creat_bitree(min * 2,max);	if(min *2 + 1 <= max)		root->rchild = creat_bitree(min * 2 + 1,max);	return root;}void pre_order(bitree * root){	if(NULL == root)		return ;	printf("%3d",root->data);	pre_order(root->lchild);	pre_order(root->rchild);}void in_order(bitree * root){	if(NULL == root)		return ;	in_order(root->lchild);	printf("%3d",root->data);	in_order(root->rchild);}void post_order(bitree * root){	if(NULL == root)		return ;	post_order(root->lchild);	post_order(root->rchild);	printf("%3d",root->data);}int main(){	bitree *root = creat_bitree(1,10);	puts("pre_order :");	pre_order(root);	putchar(10);	puts("in_order :");	in_order(root);	putchar(10);	puts("post_order :");	post_order(root);	putchar(10);	return 0;}