S>      var left = ...;
S>      var right = ...;

S>      if (left >= right)
S>      {
S>        Console.WriteLine(">=");
S>      }
S>      else if (left < right)
S>      {
S>        Console.WriteLine("<");
S>      }
S>      else
S>      {
S>        Console.WriteLine("???");
S>      }
S>

            var left = double.NaN;
            var right = double.NaN;

            if (left >= right)
            {
                Console.WriteLine(">=");
            }
            else if (left < right)
            {
                Console.WriteLine("<");
            }
            else
            {
                Console.WriteLine("???");
            }