Hello World程序样例

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

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

// A Hello World! program in C#.
using System;
namespace HelloWorld
{
    class Hello 
    {
        static void Main() 
        {
            Console.WriteLine("Hello World!");

            // Keep the console window open in debug mode.
            Console.WriteLine("Press any key to exit.");
            Console.ReadKey();
        }
    }
}

using System.IO.Compression;

#pragma warning disable 414, 3021

namespace MyApplication
{
    [Obsolete("...")]
    class Program : IInterface
    {
        public static List<int> JustDoIt(int count)
        {
            Console.WriteLine($"Hello {Name}!");
            return new List<int>(new int[] { 1, 2, 3 })
        }
    }
}

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

alert("Hello, World!");
//或者
document.write("Hello, World!");