#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <string>
#include <map>   //includes <utility>
using namespace std;

int main()
{
	typedef map<string, double> map_t;
	typedef map_t::value_type pair_t; //another name for pair<string,double>

	const pair_t a[] = {
		pair_t("Mercury",  .27),
		pair_t("Venus",    .85),
		pair_t("Earth",   1.00),
		pair_t("Mars",     .38),
		pair_t("Jupiter", 2.33),
		pair_t("Saturn",   .92),
		pair_t("Uranus",   .85),
		pair_t("Neptune", 1.12),
		pair_t("Pluto",    .44)
	};
	const size_t n = sizeof a / sizeof a[0];
	const map_t gravity(a, a + n);

	cout << "How many pounds do you weigh on Earth? ";
	double weight;
	if (!(cin >> weight)) {
		return EXIT_FAILURE;
	}

	for (;;) {
		cout << "Type name of planet, or q to quit, and press RETURN: ";

		string name;
		if (!(cin >> name)) {
			if (cin.eof()) {
				break;
			}
			return EXIT_FAILURE;
		}
		if (name == "q") {
			break;
		}

		const map_t::const_iterator it = gravity.find(name);
		if (it == gravity.end()) {
			cout << "No planet is named \"" << name << "\".\n";
		} else {
			cout << "You would weigh " << weight * it->second
				<< " pounds on " << name << ".\n";
		}
	}

	cout << "\n";
	cout << setprecision(2) << fixed;

	for (map_t::const_iterator it = gravity.begin();
		it != gravity.end(); ++it) {
		cout << left << setw(7) << it->first << right << " "
			<< setw(4) << it->second << "\n";
	}

	return EXIT_SUCCESS;
}