这个程序总是有内存错误，高手帮看下

#include <iostream>
#include <sstream>
#include <time.h>
using namespace std;

class jockgame
{
public:
    jockgame();
    void newjock();
    void xipai();
    void printjock();
private:
    string jock[52];      

};
jockgame::jockgame()
{   
    char a[4]={3,4,5,6};
    string b[13]={"A","2","3","4","5","6","7","8","9","10","J","Q","K"};
    int n=0;   
    for(int i=0;i<4;i++)
        for(int j=0;j<13;j++)
        {
           
            jock[n]=a[i]+b[j];            
            n++;            
        }
}
void jockgame::printjock()
{   
    for(int i=0;i<52;i++)
        cout<<jock[i]<<"  ";
        if(i%12==0)
            cout<<endl;
    cout<<endl<<endl<<endl;
}
void jockgame::xipai()
{
    srand(time(0));
    int n;
    string s;
    for(int i=0;i<52;i++)
    {
        n=rand()%52+1;                  //这个地方有问题，是不是随机函数调用的太多了？
        s=jock[i];
        jock[i]=jock[n];
        jock[n]=s;      
    }
}

void main()
{
    jockgame jock;
    jockgame();   
    jock.printjock();   
    jock.xipai();
    jock.printjock();   

}


[ 本帖最后由 jiansilang 于 2011-3-9 12:08 编辑 ]