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| using namespace std;
typedef struct btreenode
{
char data;
struct btreenode *lchild;
struct btreenode *rchild;
}BTreeNode, *BTree;
typedef struct
{
BTree link;
int flag;
}Stack;
void InitBTree(BTree &BT)
{
BT = NULL;
}
void CreatBTree(BTree &BT)
{
char ch;
ch = getchar();
if (ch == ' ')
BT = NULL;
else
{
BT = new BTreeNode;
BT->data = ch;
CreatBTree(BT->lchild);
CreatBTree(BT->rchild);
}
}
void PreOrder(BTree BT)
{
if (BT == NULL)
{
cout << "NULL";
return;
}
else
{
cout << BT->data;
if (BT->lchild != NULL)
PreOrder(BT->lchild);
if (BT->rchild != NULL)
PreOrder(BT->rchild);
}
}
void InOrder(BTree BT)
{
if (BT == NULL)
{
cout << "NULL";
return;
}
if (BT->lchild != NULL)
InOrder(BT->lchild);
cout << BT->data;
if (BT->rchild != NULL)
InOrder(BT->rchild);
}
void PostOrder(BTree BT)
{
if (BT == NULL)
{
cout << "NULL";
return;
}
if (BT->lchild != NULL)
PostOrder(BT->lchild);
if (BT->rchild != NULL)
PostOrder(BT->rchild);
cout << BT->data;
}
void LevelOrder(BTree BT)
{
BTree Queue[30];
int front, rear;
if (BT == NULL) return;
front = -1;
rear = 0;
Queue[rear] = BT;
while (front != rear)
{
front++;
cout << Queue[front]->data;
if (Queue[front]->lchild != NULL)
{
rear++;
Queue[rear] = Queue[front]->lchild;
}
if (Queue[front]->rchild != NULL)
{
rear++;
Queue[rear] = Queue[front]->rchild;
}
}
}
void PreOrder_2(BTree BT)
{
BTree stack[30], p;
int top;
if (BT == NULL) return;
top = -1;
p = BT;
while (!(p == NULL && top == -1))
{
while (p != NULL)
{
cout << p->data;
if (top < 30)
{
stack[top + 1] = p;
top++;
}
else
{
cout << "Stack is full!" << endl;
return;
}
p = p->lchild;
}
if (top < 0) return;
else
{
top--;
p = stack[top + 1];
p = p->rchild;
}
}
}
void PostOrder_2(BTree BT)
{
Stack s[30];
BTree p;
int top, sign;
if (BT == NULL) return;
top = -1;
p = BT;
while (!(p == NULL && top == -1))
{
if (p != NULL)
{
s[++top].link = p;
s[top].flag = 1;
p = p->lchild;
}
else
{
p = s[top].link;
sign = s[top].flag;
top--;
if (sign == 1)
{
s[++top].link = p;
s[top].flag = 2;
p = p->rchild;
}
else
{
cout << p->data;
p = NULL;
}
}
}
}
void main()
{
BTree T;
InitBTree(T);
cout << "InitTree completed!" << endl;
cout << "Create Tree:" << endl;
CreatBTree(T);
cout << "/nPreOrder:" << endl;
PreOrder(T);
cout << "/nInOrder:" << endl;
InOrder(T);
cout << "/nPosetOrder:" << endl;
PostOrder(T);
cout << "/nLevelOrder:" << endl;
LevelOrder(T);
cout << "/nPreOrder_2:" << endl;
PreOrder_2(T);
cout << "/nPostOrder_2:" << endl;
PostOrder_2(T);
system("pause");
}
|