#include <iostream>
#include <cstring>
const int N=10;
using namespace std;


class HugeInt
{
private:
    int integer[N];
public:
    HugeInt(long val=0);
    HugeInt(const char* str);
    friend HugeInt MinusHugeInt(HugeInt& h1,HugeInt& h2);
    friend HugeInt& operator + (HugeInt& h1,HugeInt& h2);
    friend HugeInt&  operator + (HugeInt& op1,int op2);
    friend HugeInt&  operator + (HugeInt& op1,char* op2);
    friend ostream& operator << (ostream& os,const HugeInt& num);
    bool operator > (const HugeInt& rhs);
    HugeInt& operator = (const HugeInt& rhs);
    HugeInt& operator - ( HugeInt& rhs);
    HugeInt& Multiply(short n);
    HugeInt& Shiftleft(int s);
    friend HugeInt& operator * (HugeInt& op1,HugeInt& op2);
    friend class HugeDouble;



       
};

HugeInt::HugeInt(long val)
{
    for(int i=0;i<N;i++)
        integer[i]=0;
    for(int i=N-1;val!=0&&i>=0;i--)
    {
        integer[i]=val%10;
        val/=10;
    }
}

HugeInt::HugeInt(const char* str)
{
    for(int i=0;i<N;i++)
        integer[i]=0;
    for(int i=N-strlen(str),j=0;i<N,j<strlen(str);i++,j++)
        if(isdigit(str[j]))
            integer[i]=str[j]-'0';
}



HugeInt& HugeInt::operator = (const HugeInt& rhs)
{
    if(this!=&rhs)
    {
        for(int i=N-1;i>=0;i--)
            this->integer[i]=rhs.integer[i];
    }
    return *this;
}


HugeInt& operator + (HugeInt& h1,HugeInt& h2)
{
    HugeInt h;
    int carry=0;
    for(int i=N-1;i>=0;i--)
    {
        h.integer[i]=h1.integer[i]+h2.integer[i]+carry;
        if(h.integer[i]>=10)
        {
            h.integer[i]%=10;
            carry=1;
        }
        else
            carry=0;
    }
    return h;
}


HugeInt&  operator + (HugeInt& op1,int op2)
{
    return op1+HugeInt(op2);
}

HugeInt&  operator + (HugeInt& op1,char* op2)
{
    return op1+HugeInt(op2);
}

ostream& operator << (ostream& os,const HugeInt& num)
{
    int i;
    for(i=0;(num.integer[i]==0)&&(i<N);i++)
    {}
    if(i==N)
        os<<0;
    else
        for(;i<N;i++)
            os<<num.integer[i];
    return os;
}

bool HugeInt:: operator > (const HugeInt& rhs)
{
    int i,j;
    for(i=0;(this->integer[i]==0)&&(i<N);i++)
    {}
    for(j=0;(rhs.integer[j]==0)&&(j<N);j++)
    {}
    if(i<j)
        return true;
    else if(i>j)
        return false;
    else
    {
        for(int s=i;s<N;s++)
        {
            if(this->integer[i]>rhs.integer[i])
                return true;
            else if(this->integer[i]<rhs.integer[i])
                return false;
        }
        return false;
    }
}


HugeInt MinusHugeInt(HugeInt& h1,HugeInt& h2)
{
    HugeInt temp;
    int carry=0;
    for(int i=N-1;i>=0;i--)
    {
        temp.integer[i]=h1.integer[i]-h2.integer[i]-carry;
        if(temp.integer[i]<0)
        {
            temp.integer[i]+=10;
            carry=1;
        }
        else
            carry=0;
    }
    return temp;
}

HugeInt& HugeInt:: operator - ( HugeInt& rhs)
{
    HugeInt temp;
    if(*this>rhs)
        temp=MinusHugeInt(*this,rhs);
    else
    {
        temp=MinusHugeInt(rhs,*this);
        int i;
        for( i=0;(temp.integer[i]==0)&&i<N;i++)
        {}
        temp.integer[i]*=-1;
    }
    return temp;
}

HugeInt& HugeInt::Multiply(short n)
{
    HugeInt temp;
    int carry=0;
    for(int i=N-1;i>=0;i--)
    {
        temp.integer[i]=n*this->integer[i]+carry;
        short m=temp.integer[i];
        if(m>=10)
        {
            temp.integer[i]%=10;
            carry=m/10;
        }
        else
            carry=0;
    }
    return temp;
}


HugeInt& HugeInt::Shiftleft(int s)             //左移s位
{
    HugeInt temp;
    if(s==0)
        return *this;
    for(int i=N-1;i>N-1-s;i--)
        temp.integer[i]=0;
    int m;
    for(m=0;(this->integer[m]==0)&&(m<N);m++)
    {}
    for(int j=N-1-s,i=N-1;j>=m-s;j--,i--)
        temp.integer[j]=this->integer[i];
    return temp;
}

HugeInt& operator * (HugeInt& op1,HugeInt& op2)
{
    HugeInt s,temp,temp1;
    int i,j;
    for(i=0;(op1.integer[i]==0)&&(i<N);i++)
    {}
    for(j=0;(op2.integer[j]==0)&&(j<N);j++)
    {}
    int m=0;
    for(int s1=N-1;s1>=j;s1--)
    {
        temp=op1.Multiply(op2.integer[s1]);
        temp1=temp.Shiftleft(m);
        m++;
        s=s+temp1;
    }
    return s;
}






int main()
{
    char*  s ="35";
    char*  s1= "55";
    HugeInt a(s), b(s1), c,d,f;
    c=(a+b);
    d=a-b;
    f=a*b;
    cout<<c<<endl;
    cout<<d<<endl;
    cout<<f<<endl;
}
    

请教大虾，对于 c=a+b这句，我加了等号重载就是错的，删掉等号重载就会输出正确！  我分析知： 在计算a+b 后 返回的h 没有 作=重载的参数，而是乱给一个数，导致输出错误！

请教大侠指教！小弟一定十分感谢！！！

[ 本帖最后由 m21wo 于 2010-10-21 20:02 编辑 ]

解决了！都不弄了！