Knowing how to write hello-world program in multiple languages is crucial to be qualified as a hello-world programmer, so here is my collection.

§C

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#include <stdio.h>
int main() {
    puts("hello world.");
    return 0;
}

§Java

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

§Haskell

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main =
  putStrLn "Hello world."

§CoffeeScript

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console.log "Hello world."