Выводит некоректное число после выполнения программы по считыванию листьев в дереве

#include "stdafx.h"
#include <iostream>
using namespace std;
struct Tree
{
    int a;
    Tree* right;
    Tree* left;
};
Tree* root;
Tree* cur;
Tree* prev;
int k = 0;
int Pods(Tree* root);
int main()
{
    root = new Tree;
    root->a = 10;
    root->left = root->right = NULL;
    ::prev = root;
    cur = new Tree;
    cur->a = 6;
    ::prev->left = cur;
    cur->left = cur->right = NULL;
    ::prev = cur;
    cur = new Tree;
    cur->a = 5;
    cur->left = cur->right = NULL;
    ::prev->left = cur;
    cur = new Tree;
    cur->a = 8;
    cur->left = cur->right = NULL;
    ::prev->right = cur;
    ::prev = root;
    cur = new Tree;
    cur->a = 11;
    cur->left = cur->right = NULL;
    ::prev->right = cur;
    ::prev = cur;
    cur = new Tree;
    cur->a = 15;
    cur->left = cur->right = NULL;
    ::prev->right = cur;
 
    cout << Pods << " list'ev" << endl;
    system("pause");
    return 0;
}
 
int Pods(Tree* root)
{
    if ((root->left == NULL) && (root->right == NULL))
    {
        k = k + 1;
        return k;
    }
    else
    {
        return Pods(root->left) + Pods(root->right);
    }
};

int Pods(Tree* root)
{
    if ((root->left == NULL) && (root->right == NULL)) return 1;
    else return Pods(root->left) + Pods(root->right);
};

cout << Pods(root) << " list'ev" << endl;