#include <iostream> using namespace std; class Point { int _x, _y; public: Point(int x=0, int y=0) : _x(x), _y(y) {} Point& operator++(); Point operator++(int); Point& operator--(); Point operator--(int); friend ostream& operator << (ostream& o, const Point& p); }; /********** Begin **********/ /********** End **********/ ostream& operator << (ostream& o, const Point& p) { o << '(' << p._x << ", " << p._y << ')'; return o; } int main() { int x,y; cin>>x>>y; Point p(x, y); cout << p << endl; cout << p++ << endl; cout << ++p << endl; cout << p-- << endl; cout << --p << endl; return 0; }

以下是完整的C++代码实现：

#include <iostream>
using namespace std;

class Point {
    int _x, _y;
public:
    Point(int x=0, int y=0) : _x(x), _y(y) {}
    Point& operator++();
    Point operator++(int);
    Point& operator--();
    Point operator--(int);
    friend ostream& operator << (ostream& o, const Point& p);
};

Point& Point::operator++() {
    _x++;
    _y++;
    return *this;
}

Point Point::operator++(int) {
    Point tmp(*this);
    _x++;
    _y++;
    return tmp;
}

Point& Point::operator--() {
    _x--;
    _y--;
    return *this;
}

Point Point::operator--(int) {
    Point tmp(*this);
    _x--;
    _y--;
    return tmp;
}

ostream& operator << (ostream& o, const Point& p) {
    o << '(' << p._x << ", " << p._y << ')';
    return o;
}

int main() {
    int x, y;
    cin >> x >> y;
    Point p(x, y);
    cout << p << endl;
    cout << p++ << endl;
    cout << ++p << endl;
    cout << p-- << endl;
    cout << --p << endl;
    return 0;
}

输入示例：

1 2

输出示例：

(1, 2)
(1, 2)
(3, 4)
(3, 4)
(1, 2)