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

int main()
{

	

	int fahrenheit {100};
	cout << "What is todays temperature (whole number, minimum 1) in degrees Fahrenheit?\n";
	cin >> fahrenheit;

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

	if (fahrenheit < 1) {
		cerr << "Sorry, it's the summertime. Global Warming has gone that far yet, must be at least 1.\n";
		return EXIT_FAILURE;   //Global warming has taken over here; feet and meters inot born yet.
				       //
	}

	//Formula "Subract 32 from the Fehrenheit and the multiply the result by 5/9." 
	double celsius {( fahrenheit - 32) *( 5.0 / 9.0)};
 
	cout << "Today temperature is  "
		<< celsius << " Celsius.\n";

	return EXIT_SUCCESS;   //fahrenheit and celsius die here.
}