string AddString(const string& a,const string & b)
{
    return a + b;
}



int _tmain(int argc, _TCHAR* argv[])
{
    const char * szA = "Zhang";
    const char * szB = 0;
    string strRet = AddString(szA,szB);
    cout<<strRet<<endl;
    system("pause");
    return 0;
}