骑士周游的问题，不知道自己哪里出错了

Question

本人才入门，搞这个问题都头破了。我想让棋子在（0.0）点走遍棋盘，输出yeah！但是却没有输出。不知道哪里出错了

 #include<iostream>
using namespace std;
void zhouyou(int,int);
bool pangduan(int, int);
int a[8][8] = { 0 };
int  hor[8] = { -1,-2,-2,-1,1,2,2,1 }, ver[8] = { 2,1,-1,-2,-2,-1,1,2 };
int k = 1;
int main()
{   
    zhouyou(0,0);
    system("pause");
}

void zhouyou(int hang, int lie)
{
    a[hang][lie] = 1;
    if (k==64)
    {
        cout << "yeah!";
    }
    for (int i = 0; i < 8; i++)
    {
        if (pangduan(hang+hor[i], lie+ver[i]))
        {
            a[hang+hor[i]][lie+ver[i]] = 1;
            k++;
            zhouyou(hang + hor[i], lie + ver[i]);
        }
    }
    k--;
}

bool pangduan(int hang, int lie)
{
    if ((hang>=0)&&(hang<8)&&(lie>=0)&&(lie<8))
    {
        if (a[hang][lie]==0)
        {
            return true;
        }
    }
    return false;
}

Answer 1

http://blog.csdn.net/yellowOri/article/details/5674350?locationNum=2&fps=1
http://blog.csdn.net/CRZbulabula/article/details/52303262?locationNum=6&fps=1