#include <iostream>
#include <cmath>
#include <ctime>
#include <cstdlib>
using namespace std;
unsigned long long factorial(int n) {
	return (n == 1 || n == 0) ? 1 : factorial(n - 1)*n;
}
int main()
{
	srand(time(NULL));
	double eps;
	cout << "Enter epsilon: ";
	cin >> eps;
	double x =30 - rand() %60;
	cout << "x = " << x << endl;
	double slag = x;
	double cur = 0;
	int sch = 2;
	/*for (int i = 1; abs(acc - cur) - eps > 0; i++) {
		acc = cur;
		double my_sin = pow(-1, i - 1)*pow(x, 2 * i - 1) / factorial(2 * i - 1);
		cur = acc + my_sin;
	}*/
	while (abs(slag) > eps) {
		cur = cur + slag;
		slag = slag * ((-1*x*x) / (sch*(sch + 1)));
		sch = sch + 2;
	}
	cur = trunc(cur / eps) * eps;
	cout << "My answer: " << cur << endl;
	cout << "Standart sin(x): " << trunc(sin(x) / eps) * eps << endl;
	cout << "Difference: " << sin(x) - cur << endl;

	system("pause");
	return 0;
}