试题出自试卷《04737《C++程序设计》真题及参考答案（2022.04）》

#include <iostream>
using namespace std;
class A{
private:
int n;
public:
A(int i){ n=i;}
A operator ++() { n++; }
A operator ++(int) { n+=2; }
void Display() { cout<<"n="<<n<<endl; }
};
int main()
A a(2), b(2);
a++;
++b;
a.Display();
b.Display();
}