#include "stdio.h"
#include "math.h"
#include "iostream"
#include "conio.h"
#include "iomanip"
#include <locale.h>

using namespace std;
double y(double, double);

int main()
{
	setlocale(LC_ALL, "Rus");
	double kol, x, a;
	kol = 0;
	cout << "Введите a\n";
	cin >> a;
	if (cin.fail())
	{
		cout << "Неправильное значение \n";
		_getch();
		return 0;
	}
	printf("________________________________________________________________\n");
	printf("|  N  |       x       |       y       |     a                  |             \n");
	printf("|-----|---------------|---------------|------------------------|\n");
	for (x = -0.9; x <= 12.6; x = x + 1.5)
	{
		if (3*x && a - tan^a(x/2) != 0)
			printf("| %3.f |\t%12.1f  | %13.6f |   %17.9f    |\n", kol, x, y(a, x), a);
		else printf("| %2.f  |\t%13.1f | Нет решения |  %18.9f    |\n", kol, x, a);

		++kol;
	}
	printf("\----------------------------------------------------------------\n");
	_getch();
	return 0;
}

double y(double a, double x)
{
	return (3 * x)/(a - tan^a(x / 2));
}