#include<iostream>
using namespace std;
class Pre_Main
{
public:
Pre_Main()
{
cout << "I'm before main!" << endl;
}
~Pre_Main()
{
cout << "I'm after main!" << endl;
}
};
//在C++中,利用全局变量和构造函数的特性,通过全局变量的构造函数执行;
Pre_Main pre_Main;
void main()
{
cout << "I'm in main!" << endl;
}