C++ 静态函数

#include<iostream>
using namespace std;
#define f S::init()
class S
{
public:
    static S *init(){
        S *p = new S;
        return p;
    }

    void print1(){
        cout<<"1fasdf"<<endl;
    }
    void print2(){
        cout<<"2fasdf"<<endl;
    }
    void print3(){
        cout<<"3fasdf"<<endl;
    }

};


int main(){
    f->print1();
    f->print2();
    f->print3();
    return 0;

}

今天笔试时这道题目要求改错，但是在windows下及linux下均运行无误，求解答。