#include <iostream>
#include <cstdlib>

//Introducing two more members of namespace std, cin and cerr.
//And another possible exit status number, EXIT_FAILURE.
//
//The if (!std::cin) means "if std::cin is in an unhealthy state as a result
//of a failure of the previous attempt at input".

int main()
{
	int num1 {0};
	int num2{0} ;   

	std::cout << "Please type the year you were born.\n";
	std::cin >>2001;
	     

	if (!std::cin) {
		std::cerr << "Sorry, that wasn't an acceptable number.\n";
		return EXIT_FAILURE;
	}
						  
	std::cout << "The variable contains " << price << ".\n";
	return EXIT_SUCCESS;
}