每日打卡一小时（第十七天）

一.问题描述

pta多态实验：

1.定义一个整数加法器类Adder，对其重载运算符“+”、“++”，main(void)函数完成对其的测试。

#include <iostream>
using namespace std;

/*请在这里填写答案*/

//主函数
int main(void){
    int x;
    Adder a1,a2(a1);
    cin>>x;
    (a1++).show();
    a1.show();
    a2.setNum(x);
    (++a2).show();
    a2.show();
    (a1+a2).show();
    return 0;
}

二.代码实现

class Adder
{
    int num;
    public:
    Adder(int n=0);
    Adder(Adder &p);
    void setNum(int x);
    int getNum()const;
    Adder operator+(const Adder &c)const;
    Adder operator++ (int);
    Adder& operator++();
    void show()const;
    ~Adder();
};
Adder::Adder(int n):num(n)
{
    cout<<"Adder Constructor run"<<endl;
}
Adder::Adder(Adder &p)
{
    this->num=p.getNum();
    cout<<"Adder CopyConstructor run"<<endl;
}
void Adder::setNum(int x)
{
    num=x;
}
int Adder::getNum() const
{
    return num;
}
Adder Adder::operator+(const Adder &c)const
{
    return Adder(this->num+c.getNum());
}
Adder& Adder::operator++()
{
    num++;
    return *this;
}
Adder Adder::operator++(int)
{
    Adder m=*this;
    ++(*this);
    return m;
}
void Adder::show()const
{
    cout<<"Adder("<<num<<")"<<endl;
}
Adder::~Adder()
{
    cout<<"Adder Destructor run"<<endl;
}