#include <iostream>
#include <cstdlib>
using namespace std;


int func1(),func2(),func3();

int main(int argc,char * argv[])
{
  _onexit(func2); //函数注册时入栈，调用时出栈 
  _onexit(func1);                   
  _onexit(func3);
  cout<<"First Line"<<endl;
  cout<<"Second Line"<<endl;
}

int func1()
{
  cout<<"fun1() is executed!"<<endl;
  return 0;
}

int func2()
{
  cout<<"fun2() is executed!"<<endl;
  return 0;
}
int func3()
{
  cout<<"fun3() is executed!"<<endl;
  return 0;
}