bitree

#include "stdio.h"
#include "stdlib.h"

#define OVERFLOW -1
#define ERROR -1
#define OK 1

typedef char Elemtype;
typedef int Status;
typedef struct BitNode
{
	Elemtype data;
	struct BitNode *lchild,*rchild;
}bitnode ,*Bitree;

int postion(Elemtype ch,Elemtype a[],int start,int end)
{
	int i;
	for(i=start;i<=end;i++)
		if (a[i]==ch)
			return i;
}

Status creatbitree_TWOorder(Bitree &t,Elemtype preorder[],int startpre,int endpre, Elemtype inorder[],int startin ,int endin)
{
	int pos,left,right;
	if (endpre-startpre!=endin-startin)
		return ERROR;
	if(endpre-startpre<0)
		t=NULL;
	else
	{
	pos=postion(preorder[startpre],inorder,startin,endin);
	left=pos-startin;
	right=endin-pos;
	printf("char=%c,pos=%d,left=%d,right=%d,--pre --- %d, %d --- in--- %d ,%d\n",preorder[startpre],pos,left,right,startpre,endpre,startin,endin);
getchar();

		if(!(t=(bitnode *)malloc(sizeof(Bitree))))  exit(OVERFLOW);
		t->data=preorder[startpre];
		creatbitree_TWOorder(t->lchild,preorder,startpre+1,left+startpre,inorder,startin,left+startin-1);
		printf("====");
	creatbitree_TWOorder(t->rchild,preorder,endpre-right+1,endpre,inorder,pos+1,endin);

	}
}

Status creatbitree(Bitree &t)
{
	char ch;
	scanf("%c",&ch);
	if(ch==' ') t=NULL;
	else
	{
		if(!(t=(bitnode *)malloc(sizeof(Bitree))))  exit(OVERFLOW);
		t->data=ch;
		creatbitree(t->lchild);
		creatbitree(t->rchild);
	}
	return OK;
}

Status printelemt(Elemtype e)
{
	printf("%c",e);
	return OK;
}

Status preordertraverse(Bitree t,Status (*visit)(Elemtype e))
{
	if(t)
	{
		if(visit(t->data))
			if(preordertraverse(t->lchild,visit))
					if(preordertraverse(t->rchild,visit))  return OK;
		return ERROR;
	}
	else
		return OK;
}

Status inordertraverse(Bitree t,Status (*visit)(Elemtype e))
{
	if(t)
	{
	    if(inordertraverse(t->lchild,visit))
		    if(visit(t->data))
				if(inordertraverse(t->rchild,visit))  return OK;
		return ERROR;
	}
	else
		return OK;
}

Status postordertraverse(Bitree t,Status (*visit)(Elemtype e))
{
	if(t)
	{
	    if(postordertraverse(t->lchild,visit))
			if(postordertraverse(t->rchild,visit))
					if(visit(t->data)) return OK;
		return ERROR;
	}
	else
		return OK;
}

main()
{
	Bitree t;
	char a[]="1245673";//preorder
	char b[]="4265713";//inorder

	creatbitree_TWOorder(t,a,0,6,b,0,6);
	//creatbitree(t);
	preordertraverse(t,printelemt);
	printf("\n");

	inordertraverse(t,printelemt);
	printf("\n");

	postordertraverse(t,printelemt);
	printf("\n");

}