打印"Hello World!"

C
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#include <stdio.h>

int main()
{
    printf("Hello World!\n");
    return 0;
}
C++
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#include <iostream>
using namespace std;

int main()
{
    cout << "Hello World!" << endl;
    return 0;
}
Java
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public class Main {
    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}
Python
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print("Hello World!")
PHP
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<?php
echo "Hello World!";
?>
C#
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using System;
namespace HelloWorld
{
    class HelloWorld
    {
        static void Main(string[] args){
            Console.WriteLine("Hello World!");
        }
    }
}