整形大数据处理

root@ubuntu:/home/chen/study/unix/bigdata# more bigdata2.c
#include <stdio.h>
#include <string.h>
#include <iostream>
using namespace std;
int NumAdd(const char *first,const char *second,char *result,int resultlen)
{
int numlen[2];
numlen[0] = strlen(first);
numlen[1] = strlen(second);
int maxlen = numlen[0] > numlen[1] ? numlen[0]:numlen[1];
if (resultlen < maxlen + 1)
return -1;
int n;
int byteValue[2];
int curByteResult=0;
int addByteResult=0;
for(n =maxlen-1;n >= 0; n--)
{
--numlen[0];
--numlen[1];
if(numlen[0] >= 0)
{
  byteValue[0] = first[numlen[0]] - '0';
  printf("numlen0=%c",first[numlen[0]]);
}
else
{
  byteValue[0] = 0;
}
if(numlen[1] >= 0)
{
  byteValue[1] = second[numlen[1]] - '0';
  printf("numlen1=%c",second[numlen[1]]);
}
else
{
  byteValue[1] = 0;
}
printf("\n");
curByteResult = byteValue[0] + byteValue[1] + addByteResult;
if(curByteResult >= 10)
{
  curByteResult -= 10;
  addByteResult = 1;
/*
  if (n == 0)
  {
   result[0] = '1';
   ++result;
  }
  else
  {
   ++result[n-1];
  }
*/

  result[n] = '0' + curByteResult;
}
else
{
result[n] = '0' + curByteResult;
addByteResult = 0;
}
printf("result[%d]=%c",n,result[n]);
//printf("%c ",first[0]);
}
//result[0]=0;
result[10]=0;
printf("result=%s\n",result);
//int i;
//for (i =0;i<11;i++)
//printf("result[%d]=%c\n",i,result[i]);
//cout<<*result<<endl;
return 1;
/*
char *n="hello world";
int nlen=0;
nlen=strlen(n);
printf("maxlen=%d\n",nlen);

printf("numlen[0]=%d,numlen[1]=%d\n",numlen[0],numlen[1]);
int numtest;
char *n=first;
numtest=sizeof(first);
printf("numtest=%d\n",numtest);
*/
}
int main()
{
char szstr1[]="1234560000";
char szstr2[] = "6666";
char result[100];
NumAdd(szstr1,szstr2,result,100);
printf("result is %s",result);
return 0;
}
root@ubuntu:/home/chen/study/unix/bigdata#

输出结果

root@ubuntu:/home/chen/study/unix/bigdata# g++ bigdata2.c -o big2
root@ubuntu:/home/chen/study/unix/bigdata# ./big2
numlen0=0numlen1=6
result[9]=6numlen0=0numlen1=6
result[8]=6numlen0=0numlen1=6
result[7]=6numlen0=0numlen1=6
result[6]=6numlen0=6
result[5]=6numlen0=5
result[4]=5numlen0=4
result[3]=4numlen0=3
result[2]=3numlen0=2
result[1]=2numlen0=1
result[0]=1result=1234566666
result is 1234566666