FizzBuzz paper-solution

 string[] formatStrings = 
     new string[] { "{0}", "Fizz", "Buzz", "FizzBuzz" };
 for (int i = 1; i < 101; i++)
 {
     int index = (3 - i % 3) / 3 + ((5 - i % 5) / 5) * 2;
     Console.WriteLine(formatStrings[index], i);
 }