Computing the sum with template iterators : vector size « vector « C++ Tutorial

1. C++ Tutorial
2. vector
3. vector size

#include <iostream>
#include <vector> 
using std::cout;
using std::endl;
using std::vector;

template <typename Iter> 
double vectorSum(Iter begin, Iter end) {
  double sum = 0.0;

  while( begin != end )
    sum += *begin++;
  return sum;        
} 

int main() {
  vector<int> sunny;
  sunny.push_back(7);  
  sunny.push_back(12);  
  sunny.push_back(15);
  cout << sunny.size() << " months on record" << endl; 
  cout << "vectorSum number of sunny days: "; 
  cout << vectorSum(sunny.begin(), sunny.end()) << endl; 

  return 0;
}

3 months on record
vectorSum number of sunny days: 34