#include<iostream>  #include<cmath>  using namespace std;  int main(){      long a,b,c;      int i,flag;      bool is_positive;      char result[9];         while(cin>>a>>b)      {          c = a+b;          if( c>0 )               is_positive = true;          else              is_positive = false;                 flag = 0;                 if(abs(c) >= 1000){              c = abs(c);  //取绝对值              for( i=0; c>0; i++){                  result[i] = c%10 + ‘0‘;  //数字转换成字符                  c = c/10;                  if(flag == 2 && c != 0 )                     {                      i++;                      result[i] = ‘,‘;   //每三个加一个逗号                        flag = 0;                  }                  else                     flag++;                           }              if( !is_positive )  //结果为负数时              {                  result[i] = ‘-‘;                  cout<<result[i];              }                 i--;  //i指向第一个数字              for(; i>=0; i--){                  cout<<result[i];              }                                 cout<<endl;          }          else         {              cout<<c<<endl;          }      }      return 0;  }