hello world！

#include <iostream>  

int main()  
{  
std::cout <<"hello world!\n";   
return 0;  
}  

新随笔 -> 添加新随笔 -> "插入代码（推荐）"按钮 -> done

转载于:https://www.cnblogs.com/USTC-ACM/archive/2012/02/26/2368448.html