Solution C

#include<stdio.h>
int main()
{printf("Hello World!");
return 0;}

Solution C++

#include <stdio.h>
int main ()
{
  printf("Hello World!");
}

Solution Java

import java.util.Scanner;

public class Main{
   private static Scanner s = new Scanner(System.in) ;
   
   public static void main(String[] args) {
	  System.out.println("Hello World!");
   }
   
}

Solution Python

print "Hello World!"