public static Earth Instance()
{
if (instance == null)
{
instance = new Earth();
}
return(instance);
}
static void Main(string[] args)
{
Earth ourOneAndOnlyEarth = Earth.Instance;
Earth theSameBigBlueEarth = Earth.Instance;
ourOneAndOnlyEarth.CountHumanPopulationFromSatelliteData();
System.Console.WriteLine($"Are Equal: {ourOneAndOnlyEarth.Equals(theSameBigBlueEarth)}");
// Same earth, same population
System.Console.WriteLine(ourOneAndOnlyEarth.GetHumanPopulationFromSatelliteData());
System.Console.WriteLine(theSameBigBlueEarth.GetHumanPopulationFromSatelliteData());
}
