题目：请使用代码计算1234567891011121314151617181920*2019181716151413121110987654321。

答：

#include "stdafx.h"#include 
     
      #include 
      
       using namespace std;int _tmain(int argc, _TCHAR* argv[]){    string strOne;    string strTwo;    cout<<"输入第一个乘数：";    cin>>strOne;    cout<<"输入第二个乘数：";    cin>>strTwo;    int lengthOne = strOne.size();    int lengthTwo = strTwo.size();    int lengthResult = lengthOne * lengthTwo;    int *result = new int[lengthResult];    memset(result, 0, lengthResult * sizeof(int));    int count = 1;    int i, j, k;    for (i = lengthTwo - 1; i >= 0; i--)    {        k = lengthResult - count;        for (j = lengthOne - 1; j >= 0; j--)        {            result[k--] += (strTwo[i] - '0') * (strOne[j] - '0');        }        count++;    }    for (i = lengthResult - 1; i > 0; i--)    {        while(result[i] >= 10)        {            result[i] -= 10;            result[i - 1]++;        }    }    for (i = 0; i < lengthResult; i++)    {        if (0 != result[i])        {            break;        }    }    cout<
       
        <<" * "<
        
         <<" = "<
        
       
      
     

运行界面如下：