创建二叉树求叶子节点个数

//求二叉树中叶子结点的个数

#include<iostream>
#define N 63

using namespace std;

char str[] = "ab#d##c#e##";  //先建立根节点，然后再左右结点建立
int i = -1;

typedef struct node
{
struct node *leftChild;
struct node *rightChild;
char data;
}BiTreeNode, *BiTree;

//生成一个结点
BiTreeNode *createNode(int i)
{
BiTreeNode * q = new BiTreeNode;
q->leftChild = NULL;
q->rightChild = NULL;
q->data = i;
return q;
}

BiTree createBiTree1()
{
BiTreeNode *p
= { NULL };
int i;
for (i = 0; i < N; i++)
p[i] = createNode(i + 1);

// 把结点连接成树
for (i = 0; i < N / 2; i++)
{
p[i]->leftChild = p[i * 2 + 1];
p[i]->rightChild = p[i * 2 + 2];
}

return p[0];
}

void createBiTree2(BiTree &T)
{
i++;
char c;
if (str[i] && '#' == (c = str[i]))
T = NULL;
else
{
T = new BiTreeNode;
T->data = c;
createBiTree2(T->leftChild);
createBiTree2(T->rightChild);
}
}

int getLeafNode(BiTree T)
{
if (NULL == T)
return 0;

if (NULL == T->leftChild && NULL == T->rightChild)
return 1;

return getLeafNode(T->leftChild) + getLeafNode(T->rightChild);
}

int main()
{
BiTree T1;
T1 = createBiTree1();
cout << getLeafNode(T1) << endl;

BiTree T2;
createBiTree2(T2);
cout << getLeafNode(T2) << endl;

return 0;
}