Of course! Here's a function returning the string "Hello world!" in each language.


In C++:

    #include <iostream>
    using namespace std;
    
    string helloWorld() {
      return "Hello world!";
    }
    
    int main() {
      cout << helloWorld() << endl;
      return 0;
    }


In C#:

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


In Java:

    public class Main {
      static String helloWorld() {
        return "Hello world!";
      }
    
      public static void main(String[] args) {
        System.out.println(helloWorld());
      }
    }


In Python:

    def hello_world():
      return "Hello world!"
    
    print(hello_world())
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence