Loops / iterators in C++ (not tested)

ross.cc

// Compile with the -std=c++0x or -std=c++11 flag

#include <iostream>
#include <set>
#include <algorithm>

int main() {
  // Create a set of numbers with the new initializer:
  std::set<int> xs{ 6, 42, 47 };

  // Sum with iterators:
  int sum0 = 0;
  for (const auto &x : xs) 
    sum0 += x;

  // "Functional" sum with <algorithm>:
  const int sum1 = std::accumulate(xs.begin(), xs.end(), 0);

  std::cout << "Sum0: " << sum0 << std::endl;
  std::cout << "Sum1: " << sum1 << std::endl;
  return 0;
}