各种编程语言的 Hello World

OCaml

print_endline "hello world";;

Ruby

puts "Hello world."

Rust

fn main() {
// Print text to the console
println!("Hello World!");
}

Perl

#!/usr/bin/perl
print "Hello World!/n";

PHP

echo("Hello, world!");
var_dump("Hello, world!");

Javascript

console.log("Hello, World!");
alert("Hello, World!");

Java

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

C

#include<stdio.h>
void main()
{
printf("Hello World!\n");
}

C++

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

C

using System;

namespace HelloWorld
{
class Program
{
/// <summary>
/// Main方法：控制台应用程序的入口
/// </summary>
/// <param name="args"></param>
static void Main(string[] args)
{
// 向控制台输出一句话
Console.WriteLine("Hello,world!");
// 窗口暂停，等待按键
Console.ReadKey();
}
}
}

Python

print "Hello, world!"        # Python2 style
print("Hello, world!")       # Python3 style

matlab

function HelloWorld()
%输出Hello，World！
%   Detailed explanation goes here
disp('Hello,World!');
end