int main()
{
	double a, b, c, deltax, Xp, Xk;
	
	
	do {
		cout << ("Wprowadz a: "); cin >> a;
		cout << ("Wprowadz delta(x): "); cin >> deltax;

	} while (a <= 0 || deltax <= 0);
	
	cout << ("Wprowadz b: "); cin >> b;
	cout << ("Wprowadz c: "); cin >> c;
	
	do {
		cout << ("Wprowadz x(p): "); cin >> Xp;
		cout << ("Wprowadz x(k): "); cin >> Xk;
	} while (Xk <= Xp);


	
	
		// Xp + (static_cast<double>(rand()) / RAND_MAX)*(Xk - Xp) 
	
}
#endif //(p4)