#include <iostream>
#include <iomanip>
#include <array>

using std::cout;
using std::cin;
using std::endl;
using std::array;

int main() {	
	const int array_num = 5;
	array<double, array_num> decimals{1.2, 4.2, 3.1, 2.2, 5};
	
	cout << "全データを表示：";
	for(auto &e: decimals)
	{
		cout << e << " ";
	}
	cout << endl;
	
	double sum = 0.0, average = 0.0;
	
	//配列名.size()で配列のサイズをゲットできます
	for(auto i = 0; i < decimals.size();i++)
	{
		sum = sum + decimals.at(i);		
	}
	average = sum/decimals.size(); //double/intは何の型になるんだっけ？ 

	cout << "SUM: " << sum << endl;
	cout << "AVE: " << average << endl;
}