各版本HelloWorld

C

#include <stdio.h>

void main(void) {
	printf("HelloWorld!");
}

C++

#include <iostream>
using namespace std;
#include <string>

void main(void) {
	cout << "HelloWorld!" << endl;
}

java

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

python

print("HelloWorld!")

Golang

package main

import "fmt"

func main() {
	fmt.Println("HelloWorld!")
}

C#

using System;
namespace HelloWorld {
	class Hello {
		public static void Main(string[] args) {
			Console.WriteLine("Hello World!");
			Console.ReadLine(); 
		}
	}
}