C


#include <stdio.h>

int main(void) {
    printf("Hello, world!\n");
    return 0;
}

C++


#include <iostream>

int main() {
    std::cout << "Hello, world!";
    return 0;
}


    print("Hello, world!")


    echo 'Hello, world!'


<!DOCTYPE html>
<html>
  <head>
    <title>Hello, world!</title>
  </head>
  <body>
    <h1>Hello, world!</h1>
  </body>
</html>


    console.log('Hello, world!');


<script>
  alert('Hello, world!');
</script>


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


Write-Host 'Hello, world!'


println "Hello, world!"