Optional FizzBuzz

Test.cs

public static void Main()
{
    var obj = new Printer();
    IFizz fizz = obj;
    IBuzz buzz = obj;
    IFizzBuzz fizzBuzz = obj;

    for (int i = 0; i < 100; i++)
    {
        if (i % 15 == 0)
            fizzBuzz.Print();
        else if (i % 3 == 0)
            buzz.Print();
        else if (i % 5 == 0)
            fizz.Print();
        else
            obj.Print(i.ToString());
    }
}

public interface IBuzz
{
    void Print(string value = "Buzz");
}

public interface IFizz
{
    void Print(string value = "Fizz");
}

public interface IFizzBuzz
{
    void Print(string value = "FizzBuzz");
}

public class Printer : IFizz, IBuzz, IFizzBuzz
{
    public void Print(string value)
    {
        Console.Write(value);
    }
}