6.27

#include<iostream>#include<initializer_list>using namespace std;int sum(initializer_list<int> const &il){int sum = 0;for (auto i : il)sum += i;return sum;}int main(){auto il = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };cout << sum(il) << endl;return 0;}