万里长征：我终于迈出了第0.1步！初中就和靳柯讨论过这种无限位的大数加法怎么实现。当时啥都不懂啊，今天自己能实现出来了！虽然类还很不完善，但是已经有雏形了，高兴~~~~~

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/*-------------------------------------------------------*
* CopyRight 2007 LiHeYuan at BeiJing JiaoTong University *
*                                                        *
* 日期:2007-3-23                                          *                                                                                  *                                                       *
* 文件名:HugeInt.h                                        *
*                                                         *
* 描述：HugeInt类的定义文件，定义了加法接口                 *
*                                                         *
---------------------------------------------------------*/

const int len=200;
class HugeInt
{
public:
 //构造函数
 HugeInt(int R);
 HugeInt(){};

 //加法接口
 HugeInt operator +(HugeInt &R);
 
 //输出接口
 Print();

 //公用接口
 int Len(){return m_len;}
private:
 int m_sign;    //符号
 int m_len;    //长度
 char m_num[len];  //存储空间
};

/*-------------------------------------------------------*
* CopyRight 2007 LiHeYuan at BeiJing JiaoTong University *
*                                                        *
* 日期:2007-3-23                                          *
*                                                        *
*                                                        *
* 文件名:HugeInt.cpp                                      *
*                                                        *
* 描述：HugeInt类的实现文件，实现了加法接口                    *
*                                                        *
---------------------------------------------------------*/

#include "HugeInt.h"
#include <iostream>
#include <cmath>
using namespace std;

HugeInt::Print()
{
 int i;
 for(i=m_len;i!=0;i--)
  cout<<m_num[i]+0;
 cout<<endl;
}

HugeInt::HugeInt(int R)
{
 if(R!=0)
 {
  if(R>0)
   m_sign=1;
  else
   m_sign=-1;
  int i=0,k=1;
  int abs_R=abs(R);
  do
  {
  i++;
  m_num[i]=abs_R%10;
  abs_R/=10;
  }while(abs_R);
  m_len=i;
 }
 else
 {
  m_num[1]=0;
  m_len=1;
  m_sign=0;
 }
}

HugeInt HugeInt::operator +(HugeInt &R)
{
 HugeInt Result(0);
 char *p,*q,*r;
 p=q=r=NULL;
 int len1,len2;
 if(Len()>R.Len())
 {
  p=this->m_num;
  q=R.m_num;
  r=Result.m_num;
  len1=Len();
  len2=R.Len();
 }
 else
 {
  p=R.m_num;
  q=this->m_num;
  r=Result.m_num;
  len1=R.Len();
  len2=Len();
 }
 int i=1,j=1,k=1,carry=0;

 while(j<=len2)
 {
  r[k]=p[i++]+q[j++]+carry;
  carry=r[k]/10;
  r[k]%=10;
  k++;
 }
 while(i<=len1)
 {
  r[k]=p[i++]+carry;
  carry=r[k]/10;
  r[k]%=10;
  k++;
 }
 if(carry>0)
 {
  r[k]=carry;
  Result.m_len=k;
 }
 else
 {
  Result.m_len=k-1;
 }
 Result.m_sign=1;
 return Result;
}

main

#include <iostream>
#include "HugeInt.h"
using namespace std;

int main()
{
 HugeInt h1(99999),h2(99999),h3(0);
 h3=h1+h2;
 h3.Print();
 return 0;
}