#include <iostream>
using namespace std;
int main()
{
	setlocale(LC_CTYPE, "Russian");
	double a = 2.8, b = (-0.3), c = 4, x, w;
	int j = 0;

	// 1. for
	cout << "Цикл for:\n";
	for (x = 1; x < 2.01; x += 0.05)
	{
		j += 1;
		if (x < 1.2)
		{
			w = a*pow(x, 2) + b*x + c;
		}
		if (x == 1.2)
		{
			w = a / x + sqrt(pow(x, 2) + 1);
		}
		if (x > 1.2)
		{
			w = (a + b*x) / (sqrt(pow(x, 2) + 1));
		}
		cout << "x=" << x;
		if (j % 2 != 0) cout << ' ';
		if (j == 1 || j == 21)  cout << "  ";
		cout<< "   w=" << w << '\n';
	}

	// 2.while
	x = 1;
	j = 0;
	cout << "\n\nЦикл while:\n";
	while (x < 2.1)
	{
		j += 1;
		if (x < 1.2)
		{
			w = a*pow(x, 2) + b*x + c;
		}
		if (x == 1.2)
		{
			w = a / x + sqrt(pow(x, 2) + 1);
		}
		if (x > 1.2)
		{
			w = (a + b*x) / (sqrt(pow(x, 2) + 1));
		}
		cout << "x=" << x; 
		if (j % 2 != 0) cout << ' ';
		if (j == 1 || j == 21)  cout << "  ";
		cout << "   w=" << w << '\n';
		x += 0.05;
	}

	system("pause");
	return 0;
}