学步园

#include "iostream"
using namespace std;
const int month = 12;
int main()
{
	double money[12], sum = 0.0, average = 0.0;
	for (int i = 0; i < 12; i++)
	{
		cin >> money[i];
		sum += money[i];
	}
	average = sum / month;
	cout.setf(ios_base::fixed);
	cout.setf(ios_base::showpoint);
	cout.precision(2);
	cout << "{1}quot; << average << endl;
}