C++PrimerPlus学习——第十一章编程练习

11-1
应该是修改list11.15，当当官方店买的，难道是盗版书吗。。。
打开file之后，操作跟cout类似

vect.h
#ifndef VECT_h_
#define VECT_h_
#include <iostream>
namespace VECTOR
{class Vector{public:enum Mode { RECT, POL };private:double x;double y;double mag;double ang;Mode mode;void set_mag();void set_ang();void set_x();void set_y();public:Vector();Vector(double n1, double n2, Mode form = RECT);void reset(double n1, double n2, Mode form = RECT);~Vector();double xval() const { return x; }double yval() const { return y; }double magval() const { return mag; }double angval() const { return ang; }void polar_mode();void rect_mode();Vector operator+(const Vector& b) const;Vector operator-(const Vector& b) const;Vector operator-() const;Vector operator*(double n) const;friend Vector operator*(double n, const Vector& a);friend std::ostream& operator << (std::ostream& os, const Vector& v);};
}#endif

vect.cpp

#include <cmath>
#include"vect.h"using namespace std;namespace VECTOR
{const double Rad_to_deg = 45.0 / atan(1.0);void Vector::set_mag(){mag = sqrt(x * x + y * y);}void Vector::set_ang(){if (x == 0.0 && y == 0.0)ang = 0.0;elseang = atan2(y, x);}void Vector::set_x(){x = mag * cos(ang);}void Vector::set_y(){y = mag * sin(ang);}Vector::Vector(){x = y = mag = ang = 0.0;mode = RECT;}Vector::Vector(double n1, double n2, Mode form){mode = form;if (form == RECT){x = n1;y = n2;set_mag();set_ang();}else if (form == POL){mag = n1;ang = n2 / Rad_to_deg;set_x();set_y();}else{cout << "Incorrect 3rd argument to Vector() -- ";cout << "vector set to 0\n";x = y = mag = ang = 0.0;mode = RECT;}}void Vector::reset(double n1, double n2, Mode form){mode = form;if (form == RECT){x = n1;y = n2;set_mag();set_ang();}else if (form == POL){mag = n1;ang = n2;set_x();set_y();}else{cout << "Incorrect 3rd argument to Vector() -- ";cout << "vector set to 0\n"; x = y = mag = ang = 0.0;mode = RECT;}}Vector::~Vector(){}void Vector::polar_mode(){mode = POL;}void Vector::rect_mode(){mode = RECT;}Vector Vector::operator+(const Vector& b) const{return Vector(x + b.x, y + b.y);}Vector Vector::operator-(const Vector& b) const{return Vector(x - b.x, y - b.y);}Vector Vector::operator-() const{return Vector(-x, -y);}Vector Vector::operator*(double n) const{return Vector(n * x, n * y);}Vector operator*(double n, const Vector& a){return a * n;}std::ostream& operator<<(std::ostream& os, const Vector& v){if (v.mode == Vector::RECT)os << "(x, y) = (" << v.x << ", " << v.y << ")";else if (v.mode == Vector::POL){os << "(m, a) = (" << v.mag << ", " << v.ang * Rad_to_deg << ")";}elseos << "Vector object mode is invalid";return os;}
}

main.cpp

#include <iostream>
#include <cstdlib>
#include <ctime>
#include <fstream>
#include "vect.h"
int main()
{using namespace std;using VECTOR::Vector;srand(time(0));double direction;Vector step;Vector result(0.0, 0.0);unsigned long steps = 0;double target;double dstep;ofstream file;file.open("C://test.txt");if (!file.is_open()) {cout << "Couldn't open the file!";exit(EXIT_FAILURE);}cout << "Enter target distance (q to quit):";while (cin >> target){cout << "Enter step length: ";if (!(cin >> dstep))break;file << "Target Distance: " << target << ", " << "Step Size: " << dstep << endl;while (result.magval() < target){direction = rand() % 360;step.reset(dstep, direction, Vector::POL);result = result + step;steps++;file << steps << ": (x, y) = (" << result.xval() << ", " << result.yval() << ")" << endl;}file << "After " << steps << " steps, the subject ""has the following location:\n";file << result << endl;result.polar_mode();file << " or\n" << result << endl;result.polar_mode();file << "Average outward distance per step = "<< result.magval() / steps << endl;steps = 0;result.reset(0.0, 0.0);cout << "Enter target distance (q to quit): ";}cout << "Bye!\n";cin.clear();while (cin.get() != '\n')continue;return 0;
}

11-2
不储存长度角度的话，去掉mag，ang，setmag()，setang(),其他函数也需要修改,main.cpp不变
vect.h

#ifndef VECT_h_
#define VECT_h_
#include <iostream>
namespace VECTOR
{class Vector{public:enum Mode { RECT, POL };private:double x;double y;Mode mode;public:Vector();Vector(double n1, double n2, Mode form = RECT);void reset(double n1, double n2, Mode form = RECT);~Vector();double xval() const { return x; }double yval() const { return y; }double magval() const;double angval() const;void polar_mode();void rect_mode();Vector operator+(const Vector& b) const;Vector operator-(const Vector& b) const;Vector operator-() const;Vector operator*(double n) const;friend Vector operator*(double n, const Vector& a);friend std::ostream& operator << (std::ostream& os, const Vector& v);};
}#endif

vect.cpp

#include <cmath>
#include"vect.h"using namespace std;namespace VECTOR
{const double Rad_to_deg = 45.0 / atan(1.0);Vector::Vector(){x = y = 0.0;mode = RECT;}Vector::Vector(double n1, double n2, Mode form){mode = form;if (form == RECT){x = n1;y = n2;}else if (form == POL){double mag, ang;mag = n1;ang = n2 / Rad_to_deg;x = mag * cos(ang);y = mag * sin(ang);}else{cout << "Incorrect 3rd argument to Vector() -- ";cout << "vector set to 0\n";x = y;mode = RECT;}}void Vector::reset(double n1, double n2, Mode form){mode = form;if (form == RECT){x = n1;y = n2;}else if (form == POL){x = n1* cos(n2);y = n1 * sin(n2);}else{cout << "Incorrect 3rd argument to Vector() -- ";cout << "vector set to 0\n"; x = y = 0.0;mode = RECT;}}Vector::~Vector(){}double Vector::magval() const{return sqrt(x * x + y * y);}double Vector::angval() const{ return (x == 0.0 && y == 0.0)?0.0:atan2(y, x);}void Vector::polar_mode(){mode = POL;}void Vector::rect_mode(){mode = RECT;}Vector Vector::operator+(const Vector& b) const{return Vector(x + b.x, y + b.y);}Vector Vector::operator-(const Vector& b) const{return Vector(x - b.x, y - b.y);}Vector Vector::operator-() const{return Vector(-x, -y);}Vector Vector::operator*(double n) const{return Vector(n * x, n * y);}Vector operator*(double n, const Vector& a){return a * n;}std::ostream& operator<<(std::ostream& os, const Vector& v){if (v.mode == Vector::RECT)os << "(x, y) = (" << v.x << ", " << v.y << ")";else if (v.mode == Vector::POL){os << "(m, a) = (" << v.magval() << ", " << v.angval() * Rad_to_deg << ")";}elseos << "Vector object mode is invalid";return os;}
}

11-3
前两个没变

main.cpp
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <fstream>
#include "vect.h"
int main()
{using namespace std;using VECTOR::Vector;srand(time(0));double direction;Vector step;Vector result(0.0, 0.0);unsigned long steps = 0;double target;double dstep;ofstream file;int N,totalsteps = 0, maxsteps = 0, minsteps = 0;double averageSteps;file.open("C://test.txt");if (!file.is_open()) {cout << "Couldn't open the file!";exit(EXIT_FAILURE);}cout << "Enter times to try: ";cin >> N;cout << "Enter target distance (q to quit):";while (cin >> target){cout << "Enter step length: ";if (!(cin >> dstep))break;for (int i = 0; i < N; i++){file << "#" << i << " Target Distance: " << target << ", " << "Step Size: " << dstep << endl;while (result.magval() < target){direction = rand() % 360;step.reset(dstep, direction, Vector::POL);result = result + step;steps++;file << steps << ": (x, y) = (" << result.xval() << ", " << result.yval() << ")" << endl;}file << "After " << steps << " steps, the subject ""has the following location:\n";file << result << endl;result.polar_mode();file << " or\n" << result << endl;result.polar_mode();file << "Average outward distance per step = "<< result.magval() / steps << endl;if (maxsteps == 0 || minsteps == 0)maxsteps = minsteps = steps;if (maxsteps < steps)maxsteps = steps;else if (minsteps > steps)minsteps = steps;totalsteps += steps;steps = 0;result.reset(0.0, 0.0);}cout << "Average steps: " << totalsteps / N << endl;cout << "Max steps: " << maxsteps << endl;cout << "Min steps: " << minsteps << endl;cout << "Enter target distance (q to quit): ";}cout << "Bye!\n";cin.clear();while (cin.get() != '\n')continue;return 0;
}

11-4
主函数不变
mytime3.h

#ifndef MYTIME3_H_
#define MYTIME3_H_
#include <iostream>class Time
{
private:int hours;int minutes;
public:Time();Time(int h, int m = 0);void AddMin(int m);void AddHr(int h);void Reset(int h = 0, int m = 0);friend Time operator+(const Time& t1, const Time& t2);friend Time operator-(const Time& t1, const Time& t2);friend Time operator*(const Time& t, double m);friend Time operator*(double m, const Time& t);friend std::ostream& operator<<(std::ostream& os, const Time& t);
};
#endif // !MYTIME3_H_

mytime3.cpp

#include"mytime3.h"Time::Time()
{hours = minutes = 0;
}Time::Time(int h, int m)
{hours = h;minutes = m;
}void Time::AddMin(int m)
{minutes += m;hours += minutes / 60;minutes %= 60;
}void Time::AddHr(int h)
{hours += h;
}void Time::Reset(int h, int m)
{hours = h;minutes = m;
}Time operator+(const Time& t1, const Time& t2)
{Time sum;sum.minutes = t1.minutes + t2.minutes;sum.hours = t1.hours + t2.hours + sum.minutes / 60;sum.minutes %= 60;return sum;
}Time operator-(const Time& t1, const Time& t2)
{Time diff;int tot1, tot2;tot1 = t1.minutes + 60 * t1.hours;tot2 = t2.minutes + 60 * t2.hours;diff.minutes = (tot2 - tot1) % 60;diff.hours = (tot2 - tot1) / 60;return diff;
}Time operator*(double mult, const Time& t)
{Time result;long totalminutes = t.hours * mult * 60 + t.minutes * mult;result.hours = totalminutes / 60;result.minutes = totalminutes % 60;return result;
}
Time operator*(const Time& t, double mult)
{ Time result;long totalminutes = t.hours * mult * 60 + t.minutes * mult;result.hours = totalminutes / 60;result.minutes = totalminutes % 60;return result;
}
std::ostream& operator<<(std::ostream& os, const Time& t)
{os << t.hours << " hours, " << t.minutes << " minutes";return os;
}

main.cpp

#include <iostream>
#include"mytime3.h"int main()
{using std::cout;using std::endl;Time aida(3, 35);Time tosca(2, 48);Time temp;cout << "Aida and Tosca:\n"; cout << aida << "; " << tosca << endl;temp = aida + tosca;cout << "Aida + Tosca: " << temp << endl;temp = aida * 1.17;cout << "Aida * 1.17: " << temp << endl;cout << "10.0 * Tosca: " << 10.0 * tosca << endl;
}

11-5
结合前面的例子，重载运算符
stonewt.h

#ifndef STONEWT_H_
#define STONEWT_H_
class Stonewt
{
private:enum { Lbs_per_stn = 14 };enum Mode { STONE, FPO };int state;int	stone;double pds_left;double pounds;Mode mode;
public:Stonewt(double lbs);Stonewt(int stn, double lbs);Stonewt();~Stonewt();void set_mode();Stonewt operator+(const Stonewt& b) const;Stonewt operator-(const Stonewt& b) const;Stonewt operator*(double n) const;friend Stonewt operator*(double n, const Stonewt& a);friend std::ostream& operator<<(std::ostream& os, const Stonewt& v);
};#endif // !STONEWT

stonewt.cpp

#include <iostream>
using std::cout;
#include "stonewt.h"Stonewt::Stonewt()
{stone = pounds = pds_left = 0;mode = STONE;
}
Stonewt::Stonewt(double lbs)
{stone = int(lbs) / Lbs_per_stn;pds_left = int(lbs) % Lbs_per_stn + lbs - int(lbs);pounds = lbs;mode = FPO;
}
Stonewt::Stonewt(int stn, double lbs)
{stone = stn;pds_left = lbs;pounds = stn * Lbs_per_stn + lbs;mode = STONE;
}
Stonewt::~Stonewt() {}void Stonewt::set_mode()
{mode = STONE;
}
Stonewt Stonewt::operator+(const Stonewt& b) const
{Stonewt temp;temp.pounds = pounds + b.pounds;temp.stone = int(temp.pounds) / 14;temp.pds_left = int(temp.pounds) % 14 + temp.pounds - int(temp.pounds);return temp;
}
Stonewt Stonewt::operator-(const Stonewt& b) const
{Stonewt temp;temp.pounds = pounds - b.pounds;temp.stone = int(temp.pounds) / 14;temp.pds_left = int(temp.pounds) % 14 + temp.pounds - int(temp.pounds);return temp;
}
Stonewt Stonewt::operator*(double n) const
{Stonewt temp;temp.pounds = pounds * n;temp.stone = int(temp.pounds) / 14;temp.pds_left = int(temp.pounds) % 14 + temp.pounds - int(temp.pounds);return temp;
}
Stonewt operator*(double n, const Stonewt& a)
{Stonewt temp;temp.pounds = a.pounds * n;temp.stone = int(temp.pounds) / 14;temp.pds_left = int(temp.pounds) % 14 + temp.pounds - int(temp.pounds);return temp;
}
std::ostream& operator<<(std::ostream& os, const Stonewt& s)
{if (s.mode == Stonewt::STONE)os << "weighed " << s.stone << " stone, " << s.pds_left << " pounds\n";else if (s.mode == Stonewt::FPO)os << "weighed " << s.pounds << " pounds\n";elseos << "Stone object mode is invalid";return os;
}

main.cpp

#include <iostream>
#include "Stonewt.h"
using std::cout;
int main()
{Stonewt wolfe(285.7);Stonewt hew(10, 15);cout << wolfe;cout << hew;wolfe.set_mode();cout << wolfe;wolfe = wolfe - hew;cout << wolfe;wolfe = wolfe + hew;cout << wolfe;wolfe = wolfe * 10;cout << wolfe;return 0;
}

11-6
stonewt.h

#ifndef STONEWT_H_
#define STONEWT_H_
class Stonewt
{
private:enum { Lbs_per_stn = 14 };int state;int	stone;double pds_left;double pounds;
public:Stonewt(double lbs);Stonewt(int stn, double lbs);Stonewt();~Stonewt();bool operator<(const Stonewt& t) const;bool operator<=(const Stonewt& t) const;bool operator>(const Stonewt& t) const;bool operator>=(const Stonewt& t) const;bool operator==(const Stonewt& t) const;bool operator!=(const Stonewt& t) const;
};#endif // !STONEWT

stone.cpp

#include <iostream>
using std::cout;
#include "stonewt.h"Stonewt::Stonewt(double lbs)
{stone = int(lbs) / Lbs_per_stn;pds_left = int(lbs) % Lbs_per_stn + lbs - int(lbs);pounds = lbs;
}
Stonewt::Stonewt(int stn, double lbs)
{stone = stn;pds_left = lbs;pounds = stn * Lbs_per_stn + lbs;
}
Stonewt::Stonewt()
{stone = pounds = pds_left = 0;
}
Stonewt::~Stonewt() {}bool Stonewt::operator<(const Stonewt& t) const
{return pounds < t.pounds;
}
bool Stonewt::operator<=(const Stonewt& t) const
{return pounds <= t.pounds;
}
bool Stonewt::operator>(const Stonewt& t) const
{return pounds > t.pounds;
}
bool Stonewt::operator>=(const Stonewt& t) const
{return pounds >= t.pounds;
}
bool Stonewt::operator==(const Stonewt& t) const
{return pounds == t.pounds;
}
bool Stonewt::operator!=(const Stonewt& t) const
{return pounds != t.pounds;
}

main.cpp

#include <iostream>
#include "Stonewt.h"
using std::cout;
using std::cin;
using std::endl;
int main()
{Stonewt arr[6] = {Stonewt(11.1,0),Stonewt(10.1,1),Stonewt(12.1,2)};Stonewt temp(11, 0);for (int i = 3; i < 6; ++i){double p;cout << "Enter pounds: ";cin >> p;arr[i] = Stonewt(p);}int Max = 0;int Min = 0;int num = 0;for (int j = 0; j < 6; ++j){if (arr[Max] < arr[j])Max = j;if (arr[Min] > arr[j])Min = j;if (arr[j] >= temp)++num;}cout << "Max element: " << Max << endl;cout << "Min element : " << Min << endl;cout << "Number of elements above 11: " << num << endl;return 0;
}

11-7
complex0.h

#ifndef COMPLEX0_H_
#define COMPLEX0_H_
#include <iostream>
class complex
{
private:double re;double im;
public:complex();complex(double x, double y);~complex();complex operator+(complex& a);complex operator-(complex& a);complex operator*(complex& a);friend complex operator*(double n, complex& a);friend complex operator*(complex& a, double n);complex operator~();friend std::ostream& operator<<(std::ostream& os, const complex& c);friend std::istream& operator>>(std::istream& is, complex& c);
};#endif // !COMPLEX0_H_

complex.cpp

#include "complex0.h"
#include <iostream>
using namespace std;complex::complex()
{re = 0;im = 0;
}
complex::complex(double x, double y)
{re = x;im = y;
}complex::~complex()
{}complex complex::operator+(complex& a)
{return complex(re + a.re, im + a.im);
}
complex complex::operator-(complex& a)
{return complex(re - a.re, im - a.im);
}
complex complex::operator*(complex& a)
{return complex(re * a.re - im * a.im, re * a.im + im * a.re);
}
complex operator*(double n, complex& a)
{return complex(n * a.re, n * a.im);
}
complex operator*(complex& a, double n)
{return complex(n * a.re, n * a.im);
}
complex complex::operator~()
{return complex(re, -im);
}
std::ostream& operator<<(std::ostream& os, const complex& a)
{os << "(" << a.re << "," << a.im << "i)";return os;
}
std::istream& operator>>(std::istream& is, complex& c)
{cout << "real: ";is >> c.re;if (!is)return is;cout << "imaginary: ";is >> c.im;return is;
}

main.cpp

#include <iostream>
using namespace std;
#include "complex0.h"int main()
{complex a(3.0, 4.0);complex c;cout << "Enter a complex number (q to quit):\n";while (cin >> c){cout << "c is " << c << "\n";cout << "complex conjugate is " << ~c << "\n";cout << "a is " << a << "\n";cout << "a + c is " << a + c << "\n";cout << "a - c is " << a - c << "\n";cout << "a * c is " << a * c << "\n";cout << "2 * c is " << 2 * c << "\n";cout << "Enter a complex number (q to quit):\n";};cout << "Done!\n";return 0;
}

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fastai学习：01_intro Questionnaire

fastai学习：01_intro Questionnaire

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fastai学习——第二个问题

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fastai学习：02_production Questionnaire

fastai学习：02_production Questionnaire

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fastai学习：04_mnist_basics Questionnaire

fastai学习：04_mnist_basics Questionnaire

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fastai学习：05_pet_breeds Questionnaire

fastai学习：05_pet_breeds Questionnaire

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fastai学习：06_multicat Questionnarie

fastai学习：06_multicat Questionnarie

1.How could multi-label classification improve the usability of the bear classifier? 可以对不存在的熊进行分类 2.How do we encode the dependent variable in a multi-label classification problem? One-hot encoding: Using a vector of zeros, with a one in each…
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【论文阅读笔记】Detecting Camouflaged Object in Frequency Domain

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ubuntu中使用firefox浏览器播放bilibili的h5网页视频

ubuntu中使用firefox浏览器播放bilibili的h5网页视频

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