【C++ Primer Plus习题】11.6

问题:

解答:
main.cpp

#include <iostream>
#include "Stonewt.h"
using namespace std;
const int SIZE = 6;int main()
{Stonewt stone_arr[SIZE] = { 253.6,Stonewt(8,0.35),Stonewt(23,0) };double input;Stonewt eleven = Stonewt(11, 0.0);Stonewt max = stone_arr[0];Stonewt min = stone_arr[0];int num = 0;for (int i = 3; i < SIZE; i++){cout << "请输入第" << i + 1 << "个元素的信息,用磅:";cin >> input;stone_arr[i] = Stonewt(input);}for (int i = 0; i < SIZE; i++){if (max < stone_arr[i])max = stone_arr[i];if (min > stone_arr[i])min = stone_arr[i];if (stone_arr[i] > eleven)num++;}cout << "max: " << max<<endl;cout << "min: " << min << endl;cout << "大于11的数量为:" << num << endl;return 0;
}

Stonewt.h

#pragma once
#include <iostream>
using namespace std;
class Stonewt
{
public:enum Mode { YIN, INT, FLOAT };
private:enum { Lbs_per_stn = 14 };int stone;double pds_left;double pounds;Mode mode;public:Stonewt(double lbs);Stonewt(int stn, double lbs);Stonewt();~Stonewt();void setMode(Mode m);Stonewt operator+(const Stonewt& s);Stonewt operator-(const Stonewt& s);Stonewt operator*(double n);bool operator>(const Stonewt& s);bool operator>=(const Stonewt& s);bool operator<(const Stonewt& s);bool operator<=(const Stonewt& s);bool operator!=(const Stonewt& s);bool operator==(const Stonewt& s);friend ostream& operator<<(ostream& os, const Stonewt& s);friend Stonewt operator*(double m, Stonewt& s) { return s * m; }
};

Stonewt.cpp

#include "Stonewt.h"
#include <iostream>
using namespace std;Stonewt::Stonewt(double lbs)
{stone = int(lbs) / Lbs_per_stn;pds_left = int(lbs) % Lbs_per_stn + lbs - int(lbs);pounds = lbs;mode = INT;
}
Stonewt::Stonewt(int stn, double lbs)
{stone = stn;pds_left = lbs;pounds = stn * Lbs_per_stn + lbs;mode = FLOAT;
}
Stonewt::Stonewt()
{stone = pounds = pds_left = 0;mode = YIN;
}
Stonewt::~Stonewt()
{}void Stonewt::setMode(Mode m)
{this->mode = m;
}
Stonewt Stonewt::operator+(const Stonewt& s)
{Stonewt temp;temp.pounds = pounds + s.pounds;temp.stone = temp.pounds / Lbs_per_stn;temp.pds_left = int(temp.pounds) % Lbs_per_stn + temp.pounds - int(temp.pounds);temp.mode = this->mode;return temp;
}
Stonewt Stonewt::operator-(const Stonewt& s)
{Stonewt temp;temp.pounds = pounds - s.pounds;temp.stone = temp.pounds / Lbs_per_stn;temp.pds_left = int(temp.pounds) % Lbs_per_stn + temp.pounds - int(temp.pounds);temp.mode = this->mode;return temp;
}
Stonewt Stonewt::operator*(double n)
{Stonewt temp;temp.pounds = pounds * n;temp.stone = temp.pounds / Lbs_per_stn;temp.pds_left = int(temp.pounds) % Lbs_per_stn + temp.pounds - int(temp.pounds);temp.mode = this->mode;return temp;
}ostream& operator<<(ostream& os, const Stonewt& s)
{if (s.mode == Stonewt::YIN){double st = s.stone + s.pds_left / Stonewt::Lbs_per_stn;os << st << " stone\n";}if (s.mode == Stonewt::INT){os << s.pounds << " pounds\n";}if (s.mode == Stonewt::FLOAT){os << s.stone << " stone, " << s.pds_left << " pounds\n";}return os;
}bool Stonewt::operator>(const Stonewt& s)
{return pounds > s.pounds;
}
bool Stonewt::operator>=(const Stonewt& s)
{return pounds >= s.pounds;
}
bool Stonewt::operator<(const Stonewt& s)
{return pounds < s.pounds;
}
bool Stonewt::operator<=(const Stonewt& s)
{return pounds <= s.pounds;
}
bool Stonewt::operator!=(const Stonewt& s)
{return pounds != s.pounds;
}
bool Stonewt::operator==(const Stonewt& s)
{return pounds == s.pounds;
}

运行结果:

考查点:

• 比较运算符重载

2024年9月5日20:19:29