数据结构——找度为二的结点

度为二的结点，即含有左子树和右子树

#include 
#include 
#include 

int count = 0;

typedef struct BiTNode
{
	char data;
	struct BiTNode *lchild, *rchild;
}BiTNode, *BiTree;
//创建二叉树
void CreateBiTree(BiTree *bt)
{
	
	char ch;
	ch = getchar();
	if (ch == '^')
		*bt = NULL;
	else
	{
		*bt = (BiTree)malloc(sizeof(BiTNode));
		(*bt)->data = ch;
		CreateBiTree(&((*bt)->lchild));
		CreateBiTree(&((*bt)->rchild));
	}
}


int InorderPrintNodes(BiTree  T)
{
	if (T == NULL)
		return 0;
	else if (T != NULL)

	{
		InorderPrintNodes(T->lchild);

		if (T->lchild != NULL  &&  T->rchild != NULL)
			printf("%c", T->data);

		InorderPrintNodes(T->rchild);
	}
	return 1;

}

int Preorder(BiTree T)
{
	if (T == NULL)
		return 0;
	else if (T != NULL)
	{
		if (T->lchild != NULL && T->rchild != NULL)
			count++;
		Preorder(T->rchild);
		Preorder(T->lchild);

	}
	return count;
}


int main()
{
	BiTree T;
	CreateBiTree(&T);

	printf("Node are:");

	InorderPrintNodes(T);
	Preorder(T);
	printf(" count is :%d\n", count);

	system("pause");
	return 0;
}