#include <iostream>
#include <cstdlib>
using namespace std;

int main()
{
	float pounds {0};
	cout << "Please type your weight on earth in pounds. ";
	cin >> pounds;

	if (!cin) {
		cerr << "Sorry, there wasn't a number.\n";
     		return EXIT_FAILURE;
	}

	if (pounds < 1) {
		cerr << "Sorry, anything less than 1 lb wouldn't be much of a surprise. Why not try your weight?\n";
		return EXIT_FAILURE;
	}

	const double moonweight {pounds * 1.622 / 9.81};

	cout << "That weighs about " << moonweight << " lbs on the moon.\n"
		<< "Isn't that neat?\n";

	return EXIT_SUCCESS;
}