C++作业（第八章）8-7

8-7对Point类重载++（自增）、--（自减）运算符，要求同时重载前缀和后缀的形式。

#include <iostream>

using namespace std;

class Point 
{
public:
    Point &operator ++();
    Point operator++(int);
    
    Point &operator --();
    Point operator--(int);
    Point() { ix = iy = 0; }
    
    int x() { return ix; }
    int y() { return iy; }
private:
    int ix, iy;
};
Point& Point::operator++()
{
    ix++;
    iy++;
    return *this;
}
Point Point::operator++(int)
{
    Point temp = *this;
    ++*this;
    return temp;
}
Point& Point::operator--()
{
    ix--;
    iy--;
    return *this;
}
Point Point::operator--(int)
{
    Point temp = *this;
    --*this;
    return temp;
}
int main()
{
    Point A;
    cout << "A的值为：" << A.x() << " , " << A.y() << endl;
    A++;
    cout << "A的值为：" << A.x() << " , " << A.y() << endl;
    ++A;
    cout << "A的值为：" << A.x() << " , " << A.y() << endl;
    A--;
    cout << "A的值为：" << A.x() << " , " << A.y() << endl;
    --A;
    cout << "A的值为：" << A.x() << " , " << A.y() << endl;
    return 0;
}