021 - Hello World!

Hello World!

C

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

C++

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

Text(cat)

Hello World!

※出力の最後の改行を忘れないこと。

Java

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

C#

using System;
namespace HelloWorld
{
    class Hello
    {
        static void Main()
        {
            Console.WriteLine("Hello World!");
        }
    }
}

Perl

print "Hello World!\n";

PHP

<?php
echo "Hello World!\n";

Python2 / 3

print("Hello World!")

Ruby

puts "Hello World!"

Bash

echo Hello World!

Haskell

main = do
    putStrLn "Hello World!"