C++

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

C#

using System;
class Program
{
    public static void Main(string[] args)
    {
        Console.WriteLine("Hello, world!");
    }
}

Python 3

print("Hello, World!")

Javascript

console.log("Hello, World!")

Rust

fn main() {
    println!("Hello, World!!!");
}