#include <iostream> using namespace std; class A { float *p; int n; public: A(int s){ n=s; p=new float[n]; } ~A() { delete[] p; } int Getn() const { return n; } float & operator[](int i) { return _________; } void Print() { int i; for(i=0;i< this->Getn();i++) {cout<<p[i];} } }; int main() { A a(5); for (int i=0;i<a.Getn();i++) a[i]=i+1; a.Print(); return 0; }运行结果是12345,请为横线处选择合适的程序( )