whizbang.php

<?php
for ($i = 1; $i <= 20; $i++)
{
    if($i % 3 == 0 && $i % 5 ==0){
        echo "WhizzBang\n";
    }
    else if($i % 3 == 0){
        echo "Whizz\n";
    }
    else if($i % 5 == 0){
        echo "Bang\n";
    }
    else {
        echo $i."\n";
    }
}

whizzbang.cs

static void Main()
{
  for (int n = 1; n <= 20; n++)
  {
    if (n % 15 == 0)
    {
      Console.WriteLine("WhizzBang");
    }
    else if (n % 3 == 0)
    {
      Console.WriteLine("Whizz");
    }
    else if (n % 5 == 0)
    {
      Console.WriteLine("Bang");
    }
    else
    {
      Console.WriteLine(n);
    }
  }

  // Prevents program from exiting
  Console.ReadLine();
}