#include
#include
using namespace std;
class INT
{
    char *p_num;
    int len;
public:
    //构造函数
    INT()
    {
        p_num = NULL; len = 0;
    }
    INT(const char *p)
    {
     len = strlen(p)+1;
      p_num=new char[strlen(p)+1];
      strcpy(p_num,p);
    }//拷贝函数
    INT(const INT &s)
    {
        len = s.len;
        p_num=new char[strlen(s.p_num)+1];
           strcpy(p_num,s.p_num);
    }

    //赋值函数
    INT & operator=(const INT &s)
    {
    
        delete[]p_num;
        len = s.len;
        p_num = new char[strlen(s.p_num) + 1];
        strcpy(p_num, s.p_num);
        return *this;
    }
    //析构函数
    ~INT()
    {
        delete []p_num;
        p_num=NULL;
        len = 0;
    }
    //下面三个重载函数实现INT型与int型混合运算
    friend INT operator+(const INT &x1, const INT &x2);
    friend INT operator+(const INT &x, int y);
    friend INT operator+(int y, const INT &x);
    //显示数据
    void display()const
    {
        for (int i = 0; i =x2.len)
    {
    
        for (int i = temp.len-1; i >= 0; i--) { temp.p_num[i] = '0'; }
        for (int i = x2.len-1; i >= 0; i--)
        {
            temp.p_num[i] = temp.p_num[i] + x1.p_num[i] + x2.p_num[i] - '0';
            if (temp.p_num[i] - '0' > 10)
            {
                temp.p_num[i] -= 10; temp.p_num[i - 1] += 1;
            }
        }
        for (int i = temp.len-x2.len-1; i >= 0; i--)
        {
            temp.p_num[i] +=x1.p_num[i];
        }
    }
    else
    {
        for (int i = temp.len-1; i >= 0; i--) { temp.p_num[i] = '0'; }
        for (int i = x1.len-1; i >= 0; i--)
        {
            temp.p_num[i] = temp.p_num[i] + x1.p_num[i] + x2.p_num[i] - '0';
            if (temp.p_num[i] - '0' > 10)
            {
                temp.p_num[i] -= 10; temp.p_num[i - 1] += 1;
            }
        }
        
        for (int i = temp.len-1; i >= 0; i--)
        {
            
            temp.p_num[i] += x2.p_num[i];
        }
       }
    return temp;
}
int main()
{
    INT x,y,z;
    x = "123456789";
    y = "12";
    z=x+y;
    z.display();
    system("pause");
    return 0;
}