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!"

C # include <stdio.h> int main ( void ) { printf ( "Hello, world!\n" ); return 0 ; }