#include<iostream>
using  namespace std;

template<typename T>  struct sum_traits;


template<>  struct sum_traits<char> {
typedef int sum_type; 
};
template<>  struct sum_traits<int> {
typedef long int sum_type; 
};
template<>  struct sum_traits<float> {
typedef double sum_type; 
};
template<>  struct sum_traits<double> {
typedef double sum_type; 
};

template<typename Traits,typename T > 
typename Traits::sum_type sum(T *beg,T *end) { 
  typedef typename Traits::sum_type sum_type;
  sum_type total = sum_type(); 
  while(beg != end ) { 
    total += *beg; beg++; 
  } 
  return total; 
};

template<typename T > 
typename sum_traits<T>::sum_type sum(T *beg,T *end) { 
  return sum<sum_traits<T>, T>(beg,end);
}


struct char_sum {
  typedef char sum_type;
};


main() {
char name[]="@ @ @";
int length=strlen(name);

 cout<<(int)sum(name,&name[length])<<endl;

 cout<<(int)sum<char_sum>(name,&name[length])<<endl;

 cout<<(int)sum<char>(name,&name[length])<<endl;

}