#include <iostream>
using namespace  std;

int main()
{
	float X, E, E10;
	float summary, summaryE, summaryE10;
	int N, nE, nE10;

	summary = summaryE = summaryE10 = 0;
	nE = nE10 = 0;

	cout << "Enter N = ";
	cin >> N;
	while (N <= 0)
	{
		system("cls");
		cout << "N should be positive" << endl;
		cout << "Enter N = ";
		cin >> N;
	}
	cout << "Enter X = ";
	cin >> X;

	cout << "Enter Epsilon = ";
	cin >> E;

	E = abs(E);
	E10 = E / 10;

	float temp = 1, denum = 1;
	int scale = 1;
	for (int i = 1; i < N; i++)
	{
		if (abs(temp) > E10)
		{
			if (abs(temp) > E)
			{
				nE++;
				summaryE += temp;
			}
			nE10++;
			summaryE10 += temp;
		}
		summary += temp;
		scale += 2;
		denum *= scale * (scale - 1);

		temp *= (-1 * X * X) / denum;
	}

	cout << "Left side = " << sin(X) / X << " | Right side = " << summary << endl;
	cout << "The difference between right and left sides is " << abs(sin(X) / X - summary) << endl << endl;
	cout << "The summary if " << nE << " elements, that higher tnan E = " << E << " equals " << summaryE << endl;
	cout << "The summary if " << nE10 << " elements, that higher tnan E/10 = " << E10 << " equals " << summaryE10 << endl;
	return 0;
}