#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<iomanip>
#include<string>
using namespace std;

class Array
{
	friend ostream &operator<<(ostream&, const Array&);
	friend istream &operator>>(istream&, Array&);
	public:
		Array(int * = 0, int * = 0, int * = 0);

		Array &operator+(const Array&rhs)const
		{
			return Array();
		}

		Array &operator-(const Array&rhs)const
		{
			return Array();
		}

		bool operator>(const Array&rhs)const
		{
			return avg1 > rhs.avg2;
		}

		bool operator<=(const Array&rhs)const
		{
			return avg1 <= rhs.avg2;
		}

		Array &operator--(); //preincrement
		Array &operator--(int); // postincrement

	private:
		int a1[10], a2[10], a3[10];
		float avg1, avg2;
};

Array::Array(int a[10], int b[10], int c[10])
{
	for (int i = 1; i <= 10; i++)
	{
		a1[i] = a[i];
		a2[i] = b[i];
		a3[i] = c[i];
	}
}

ostream &operator<<(ostream &output, const Array &a)
{
	for (int i = 1; i <= 10; i++)
	{
		output << a.a1[i] << ' ';
	}

	for (int i = 1; i <= 10; i++)
	{
		output << a.a2[i] << ' ';
	}
	return output;
}

istream &operator>>(istream &input, Array &a)
{
	for (int i = 1; i <= 10; i++)
	{
		input >> a.a1[i];
	}

	for (int i = 1; i <= 10; i++)
	{
		input >> a.a2[i];
	}
	return input;
}

int main()
{
	Array a, b, sum, diff;
	cout << "Enter data for first array: ";
	cin >> a;
	cout << "Enter data for second array: ";
	cin >> b;
	sum = a + b;
	diff = a - b;
	cout << "First array: " << a << endl << endl;
	cout << "Second array: " << b << endl << endl;
	cout << "Sum: " << sum << endl << endl;
	cout << "Difference: " << diff << endl << endl;
	if (a > b)
		cout << "First average without highest & lowest values, is bigger" << endl;
	if (a <= b)
		cout << "First average without highest & lowest values, is smaller or equal to" << endl << endl;
	cout << "Predecrement: " << --a << endl;
	cout << "Postdecrement: " << a-- << endl;
	cout << "After Postdecrement: " << a << endl;
	system("PAUSE");
	return 0;
}