#include <iostream>
#include <cstdlib>
#include <chrono>
#include <random>
#include <functional>
using namespace std;

int main()
{
	cout << "I am thinking of a number in the range 1 to 100 inclusive.\n"
		<< "Keep trying until you guess it.\n\n";

	unsigned seed {chrono::system_clock::now().time_since_epoch().count()};
	default_random_engine engine {seed};
	uniform_int_distribution<int> distribution {1, 100};
	auto r {bind(distribution, engine)};

	const int correct {r()};
	int guesses {0};

	for (;;) {
		cout << "Go ahead: ";
		int guess {0};
		cin >> guess;

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

		++guesses;

		if (guess == correct) {
			break;
		}

		if (guess < correct) {
			cout << "Too low.";
		} else {
			cout << "Too high.";
		}

		cout << "  Try again.\n\n";
	}

	cout << "That's right, the number was " << correct << ".\n";
	cout << "It only took you " << guesses << " guess"
	     << (guesses == 1 ? "" : "es") << "!\n";

	return EXIT_SUCCESS;
}