POJ1503: Integer Inquiry(连续多个大整数加法运算)

 #include<iostream>
 #include<cstring>
 using namespace std;
 string sum;
 const int max_len = ;
 string tool(string a){
     int dif = max_len - a.length();
     string s = "";
     for(int i=;i<dif;i++){
         s += '';
     }
     s+=a;
     return s;
 }
 void solve(string a){
     a = tool(a);
     sum = tool(sum);
     string ssum;
     ssum = tool(ssum);

     for(int i=max_len-;i>=;i--){
         int temp = (sum[i] -'') + (a[i] - '');
         int c = ssum[i]-''+temp;
         ssum[i] = c% + '';
         ssum[i-] = (ssum[i-]-''+c/) + '';
     }

     sum = ssum;
 }
 int main(){
     string a; sum = "";
     while(cin>>a && a!=""){
         solve(a);
     }
     int i;
     for(i=;i<max_len;i++){
         if(sum[i]!='')   break;
      }
      for(int j=i;j<max_len;j++){
          cout<<sum[j];
      }cout<<endl;
 }