Hello, world

  print "Hello, world."

  #include <stdio.h>
 
  int main(void)
  {
    puts("Hello, world.");
    return 0;
  }

  #include <iostream>
 
  int main()
  {
    std::cout << "Hello, world.\n";
  }

  public class HelloWorld {
    public static void main(String[] args) {
      System.out.println("Hello, world.");
    }
  }