个人简介

import java.util.*;

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

#include<iostream>
using namespace std;

int main()
{
cout << "Hello,World!\n";
return 0;
}

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