编程语言的Hello World程序

Java

public class HelloWorld{
	public static void main(String[] arg){
    	System.out.print("Hello World!");
   	}
}

C

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

C++

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

Python

print("Hello, World!")