日期增减

class DateCt
{
private:
    string date;
    char* ch;
public:
    DateCt(char*);
    string operator++();
    void putOut()
    {
        cout<<date<<endl;
    }
};
DateCt::DateCt(char* m_c)
{
    date = m_c;
    ch = "";
}

string DateCt::operator++()
{
    char tmp[20];
    int i_tmp = atoi(date.c_str())+1;
    sprintf(tmp,"%d",i_tmp);
    date = tmp;
                                                                            
    return date;
}

int main()
{
    DateCt ct("20120505");// 06 ,07
    ct++;
    ct.putOut();
    return 0;
}