#include <iostream>
using namespace std;

template<class T>
double average(T arr[], int size) {
	long sum = 0;
	for (int i = 0; i < size; i++) {

		sum += arr[i];
	}
	double result = sum / size;
	return result;
}

int main() {
	int arr1[] = { 3, 5, 6, 2, 6, 7 };
	unsigned long arr2[] = { 3000000000, 4000000001, 4000000002 };
	double arr3[] = {2.1, 8.8, 10.5, 11.3};
	char arr4[] = "ab";

	int size1 = sizeof(arr1) / sizeof(arr1[0]);
	cout << average(arr1, size1) << endl;

	int size2 = sizeof(arr2) / sizeof(arr2[0]);
	cout << average(arr2, size2) << endl;

	int size3 = sizeof(arr3) / sizeof(arr3[0]);
	cout << average(arr3, size3) << endl;

	int size4 = sizeof(arr4) / sizeof(arr4[0]);
	//printf("%lf", average(arr4, size4));
	cout << average(arr4, size4) << endl;
	return 0;
}