## HelloWorld程序 ##

C++

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

C

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

Python

print("HelloWorld!")

Java

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