Hello World

Scala

 object HelloWorld extends Application {
     println("Hello world!")
 }
 

Java

 public class Hello {

	public static void main(String[] args) {
		System.out.println("Hello World!");
	}

 }
 

c#

 using System;
 class ExampleClass
 {
     static void Main()
     {
         Console.WriteLine("Hello, world!");
     }
 }
 

PHP

 <?php
    echo("Hello World!");
 ?>
 

Python (versions 1 and 2)

 print "Hello World!"
 

Python3

 print("Hello World!")