#include<iostream>
using namespace std;
void f()
{
cout<<"Happy!"<<endl;
}
int main()
{
void print_(void (*p)());
print_(f);
}
void print_(void (*p)())
{
(*p)(); //注意這裏
using namespace std;
void f()
{
cout<<"Happy!"<<endl;
}
int main()
{
void print_(void (*p)());
print_(f);
}
void print_(void (*p)())
{
(*p)(); //注意這裏
}