Hello world——程序员的第一篇代码

Hello world 是和A+B问题并驾齐驱的一道题，也是当世的经典题之一。

题目：

输出“Hello world”
    样例输入

样例输出
    Hello world

Hello world 这道题嘛，

我怎么可能只讲最简单的做法呢？
前方高能
C++

 #include<isotream>
    using namespace std;
    int main(){
        cout<<"Hello world";
    }

C

#include <stdio.h>
    int main(void) {
        printf("Hello world");
        return ;
    }

Go

 package main
    import "fmt"
    func main() {
        fmt.Printf("%s\n", "hello world")
    }

R

cat("hello world\n")

rust

 fn main() {
        println!("hello world");
    }

lisp

  *(format t "Hello World") 

D

 import std.stdio;
    void main()
    {
      writeln("hello world");
    }

perl

print "hello world\n";

python

 #!/usr/bin/python
    # -*- coding: utf- -*-
    import sys
    if True :
        print('Hello world')

nim

echo "hello world"

haskell

 main = putStrLn "hello world"

ruby

 puts "Hello world"    

scala

  println("hello world")

clojure

 (ns clojure.examples.hello
        (:gen-class))

    (defn hello-world [username]
    (println (format "Hello%s" username)))

    (hello-world "world")

groovy

    class Greet {
    def name
    Greet(who) { name = who[].toUpperCase() +
                    who[..-] }
    def salute() { println "Hello world" }
    }

    g = new Greet('world')  // create object
    g.salute()

END