C++ Primer Plus第五版 第11章 编程练习答案
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/******************************************************************************************************************* Author : Cui mingyang Blog : cx_12586 Time : 2017/11/20 From : C++ Primer Plus第五版第11章编程练习 第1题 *******************************************************************************************************************/ //头文件#ifndef MODVECTOR_H_#define MODVECTOR_H_#include <iostream>namespace VECTOR{using std::ostream;class Vector{private:double x; // horizontal valuedouble y; // vertical valuechar mode; // 'r' = rectangular, 'p' = polar// private methods for setting valuesvoid set_mag();void set_ang();void set_x(double, double);void set_y(double, double);public:Vector();Vector(double n1, double n2, char form = 'r');void set(double n1, double n2, char form = 'r');~Vector();double xval() const {return x;} // report x valuedouble yval() const {return y;} // report y valuedouble magval() const; // report magnitudedouble angval() const; // report anglevoid polar_mode(); // set mode to 'p'void rect_mode(); // set mode to 'r'// operator overloadingVector operator+(const Vector & b) const;Vector operator-(const Vector & b) const;Vector operator-() const;Vector operator*(double n) const;// friendsfriend Vector operator*(double n, const Vector & a);friend ostream & operator<<(ostream & os, const Vector & v);};} // end namespace VECTOR#endif//头文件对应的cpp文件#include <cmath>#include "vect.h" // includes <iostream>using std::sqrt;using std::sin;using std::cos;using std::atan2;using std::cout;namespace VECTOR{const double Rad_to_deg = 57.2957795130823;// private methods// calculates magnitude from x and y// set x from polar coordinatevoid Vector::set_x(double mag, double ang){x = mag * cos(ang);}// set y from polar coordinatevoid Vector::set_y(double mag, double ang){y = mag * sin(ang);}// public methodsVector::Vector() // default constructor{x = y = 0.0;mode = 'r';}// construct vector from rectangular coordinates if form is r// (the default) or else from polar coordinates if form is pVector::Vector(double n1, double n2, char form){mode = form;if (form == 'r'){x = n1;y = n2;}else if (form == 'p'){set_x(n1, n2 / Rad_to_deg);set_y(n1, n2 / Rad_to_deg);}else{cout << "Incorrect 3rd argument to Vector() -- ";cout << "vector set to 0\n";x = y = 0.0;mode = 'r';}}// set vector from rectangular coordinates if form is r (the// default) or else from polar coordinates if form is pvoid Vector:: set(double n1, double n2, char form){mode = form;if (form == 'r'){x = n1;y = n2;}else if (form == 'p'){set_x(n1, n2 / Rad_to_deg);set_y(n1, n2 / Rad_to_deg);}else{cout << "Incorrect 3rd argument to Vector() -- ";cout << "vector set to 0\n";x = y = 0.0;mode = 'r';}}Vector::~Vector() // destructor{}double Vector::magval() const // report magnitude{return sqrt(x*x +y*y);}double Vector::angval() const // report angle{if (x == 0.0 && y == 0.0)return 0;elsereturn atan2(y, x);}void Vector::polar_mode() // set to polar mode{mode = 'p';}void Vector::rect_mode() // set to rectangular mode{mode = 'r';}// operator overloading// add two VectorsVector Vector::operator+(const Vector & b) const{return Vector(x + b.x, y + b.y);}// subtract Vector b from aVector Vector::operator-(const Vector & b) const{return Vector(x - b.x, y - b.y);}// reverse sign of VectorVector Vector::operator-() const{return Vector(-x, -y);}// multiple vector by nVector Vector::operator*(double n) const{return Vector(n * x, n * y);}// friend methods// multiply n by Vector aVector operator*(double n, const Vector & a){return a * n;}// display rectangular coordinates if mode is r,// else display polar coordinates if mode is postream & operator<<(ostream & os, const Vector & v){if (v.mode == 'r')os << "(x,y) = (" << v.x << ", " << v.y << ")";else if (v.mode == 'p'){os << "(m,a) = (" << v.magval() << ", "<< v.angval() * Rad_to_deg << ")";}elseos << "Vector object mode is invalid";return os;}} // end namespace VECTOR//main函数#include <iostream>#include <cstdlib> // rand(), srand() prototypes#include <ctime> // time() prototype#include "vect.h" int main(){using namespace std;using VECTOR::Vector;srand(time(0)); // seed random-number generatordouble direction;Vector step;Vector result(0.0, 0.0);unsigned long steps = 0;double target;double dstep;//记录实验的次数cout << "Please enter the number of test: ";int num;cin >> num;double sum,min_step,max_step,temp;sum=max_step=temp=0;min_step=100;int i=0;cout << "Enter target distance (q to quit): ";while (i< num && cin >> target ){cout << "Enter step length: ";if (!(cin >> dstep))break;while (result.magval() < target){direction = rand() % 360;step.set(dstep, direction, 'p');result = result + step;steps++;}// 计算最大最小和平均步数temp = result.magval()/steps;sum += temp;if (temp < min_step)min_step = temp;else if (temp > max_step)max_step = temp;steps = 0;result.set(0.0, 0.0);cout << "Enter target distance (q to quit): ";//记录实验次数i++;}cout << "The max step is " << max_step << ", and the min step is " << min_step << ", the mean step is " << sum/num <<endl;cout << "Bye!\n";system("pause");return 0;}/******************************************************************************************************************* Author : Cui mingyang Blog : cx_12586 Time : 2017/11/20 From : C++ Primer Plus第五版第11章编程练习 第2题 *******************************************************************************************************************/ //头文件#ifndef VECTOR_H_ #define VECTOR_H_ #include <iostream> namespace VECTOR { class Vector { public: enum Mode { RECT, POL }; private: double x; double y; Mode mode; void set_x(double mag, double ang); void set_y(double mag, double ang); 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 sqrt(x * x + y * y); } double angval() const { if (x == 0.0 && y == 0.0) return 0.0; else return atan2(y, x); } 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 //头文件对应的cpp文件#include <cmath> #include "vector.h" using std::sqrt; using std::sin; using std::cos; using std::atan; using std::atan2; using std::cout; namespace VECTOR { const double Rad_to_deg = 45.0 / atan(1.0); void Vector::set_x(double mag, double ang) { x = mag * cos(ang); } void Vector::set_y(double mag, double ang) { y = mag * sin(ang); } 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) { set_x(n1, n2); set_y(n1, n2); } else { cout << "Incorrect 3rd argument to Vector() -- "; cout << "vector set to 0\n"; x = y = 0.0; mode = RECT; } } void Vector::reset(double n1, double n2, Mode form) { mode = form; if (form == RECT) { x = n1; y = n2; } else if (form == POL) { set_x(n1, n2); set_y(n1, n2); } else { cout << "Incorrect 3rd argument to Vector() -- "; cout << "vector set to 0\n"; x = y = 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.magval() << ", " << v.angval() * Rad_to_deg << ")"; else os << "Vector object mode is invalid"; return os; } } //main函数#include <iostream> #include <cstdlib> #include <ctime> #include "vector.h" int main() { srand(time(0)); double direction; VECTOR::Vector step; VECTOR::Vector result(0.0, 0.0); unsigned long steps = 0; double target; double dstep; std::cout << "Enter target distance (q to quit): "; while (std::cin >> target) { std::cout << "Enter step length: "; if (!(std::cin >> dstep)) break; while (result.magval() < target) { direction = rand() % 360; step.reset(dstep, direction, VECTOR::Vector::POL); result = result + step; steps++; } std::cout << "After " << steps << " steps, the subject has the following location:\n"; std::cout << result << std::endl; result.polar_mode(); std::cout << " or\n" << result << std::endl; std::cout << "Average outward distance per step = " << result.magval() / steps << std::endl; steps = 0; result.reset(0.0, 0.0); std::cout << "Enter target distance (q to quit): "; } std::cout << "Bye!\n"; std::cin.clear(); while(std::cin.get() != '\n') continue; system("pause"); return 0; } /******************************************************************************************************************* Author : Cui mingyang Blog : cx_12586 Time : 2017/11/20 From : C++ Primer Plus第五版第11章编程练习 第3题 *******************************************************************************************************************/ //头文件#ifndef VECTOR_H_ #define VECTOR_H_ #include <iostream> namespace VECTOR { class Vector { public: enum Mode { RECT, POL }; private: double x; double y; Mode mode; void set_x(double mag, double ang); void set_y(double mag, double ang); 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 sqrt(x * x + y * y); } double angval() const { if (x == 0.0 && y == 0.0) return 0.0; else return atan2(y, x); } 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 //头文件对应的cpp文件#include <cmath> #include "vector.h" using std::sqrt; using std::sin; using std::cos; using std::atan; using std::atan2; using std::cout; namespace VECTOR { const double Rad_to_deg = 45.0 / atan(1.0); void Vector::set_x(double mag, double ang) { x = mag * cos(ang); } void Vector::set_y(double mag, double ang) { y = mag * sin(ang); } 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) { set_x(n1, n2); set_y(n1, n2); } else { cout << "Incorrect 3rd argument to Vector() -- "; cout << "vector set to 0\n"; x = y = 0.0; mode = RECT; } } void Vector::reset(double n1, double n2, Mode form) { mode = form; if (form == RECT) { x = n1; y = n2; } else if (form == POL) { set_x(n1, n2); set_y(n1, n2); } else { cout << "Incorrect 3rd argument to Vector() -- "; cout << "vector set to 0\n"; x = y = 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.magval() << ", " << v.angval() * Rad_to_deg << ")"; else os << "Vector object mode is invalid"; return os; } } //main函数#include <iostream> #include <cstdlib> #include <ctime> #include "vector.h" int main() { srand(time(0)); double direction; VECTOR::Vector step; VECTOR::Vector result(0.0, 0.0); unsigned long steps = 0; double target; double dstep; int N; unsigned long max = 0; unsigned long min = 999; double avg = 0; std::cout << "Enter N times to test: "; std::cin >> N; for (int i = 0; i < N; ++i) { std::cout << "Enter target distance (q to quit): "; std::cin >> target; std::cout << "Enter step length: "; if (!(std::cin >> dstep)) break; while (result.magval() < target) { direction = rand() % 360; step.reset(dstep, direction, VECTOR::Vector::POL); result = result + step; steps++; } max = (max < steps) ? steps : max; min = (min > steps) ? steps : min; avg += steps; result.polar_mode(); steps = 0; result.reset(0.0, 0.0); } avg /= N; std::cout << "max: " << max << std::endl << "min: " << min << std::endl << "average: " << avg << std::endl; std::cout << "Bye!\n"; std::cin.clear(); while (std::cin.get() != '\n') continue; system("pause"); return 0; } /******************************************************************************************************************* Author : Cui mingyang Blog : cx_12586 Time : 2017/11/20 From : C++ Primer Plus第五版第11章编程练习 第4题 *******************************************************************************************************************/ //头文件#ifndef TIMER_H_ #define TIMER_H_ #include <iostream> class Timer { private: int hours; int minutes; public: Timer(); Timer(int h, int m = 0); void AddMin(int m); void AddHr(int h); void Reset(int h = 0, int m = 0); friend Timer operator+(const Timer &t1, const Timer &t2); friend Timer operator-(const Timer &t1, const Timer &t2); friend Timer operator*(const Timer &t, double n); friend Timer operator*(double n, const Timer &t); friend std::ostream &operator<<(std::ostream &os, const Timer &t); }; #endif //头文件对应的cpp文件#include "Timer.h" Timer::Timer() { hours = minutes = 0; } Timer::Timer(int h, int m) { hours = h; minutes = m; } void Timer::AddMin(int m) { minutes += m; hours += minutes / 60; minutes %= 60; } void Timer::AddHr(int h) { hours = (hours + h) % 24; } void Timer::Reset(int h, int m) { hours = h; minutes = m; } Timer operator+(const Timer &t1, const Timer &t2) { Timer t; t.minutes = t1.minutes + t2.minutes; t.hours = t1.hours + t2.hours + t.minutes / 60; t.minutes %= 60; t.hours %= 24; return t; } Timer operator-(const Timer &t1, const Timer &t2) { Timer t; t.minutes = (t1.hours * 60 + t1.minutes) - (t2.hours * 60 + t2.minutes); t.hours = t.minutes / 60; t.minutes %= 60; return t; } Timer operator*(const Timer &t, double n) { Timer Temp; Temp.minutes = t.hours * 60 * n + t.minutes * n; Temp.hours = Temp.minutes / 60; Temp.minutes %= 60; return Temp; } Timer operator*(double n, const Timer &t) { return operator*(t, n); } std::ostream &operator<<(std::ostream &os, const Timer &t) { os << t.hours << ":" << t.minutes; return os; } //main函数#include "Timer.h" #include <iostream> int main() { Timer t1(12, 53); Timer t2(14, 00); std::cout << t1 + t2 << std::endl; system("pause");return 0; } /******************************************************************************************************************* Author : Cui mingyang Blog : cx_12586 Time : 2017/11/20 From : C++ Primer Plus第五版第11章编程练习 第5题 *******************************************************************************************************************/ //头文件#ifndef STONEWT_H_ #define STONEWT_H_ #include <iostream> enum Mode { POUNDS, STONE }; class Stonewt { private: static const int Lbs_per_stn = 14; Mode mode; int stone; double pds_left; double pounds; public: Stonewt(double lbs); Stonewt(int stn, double lbs); Stonewt(); ~Stonewt() {}; void SetMode(Mode form); friend Stonewt operator+(const Stonewt &s1, const Stonewt &s2); friend Stonewt operator-(const Stonewt &s1, const Stonewt &s2); friend Stonewt operator*(const Stonewt &s1, const Stonewt &s2); friend std::ostream &operator<<(std::ostream &os, const Stonewt &s); }; #endif //头文件对应的cpp文件#include "stonewt.h" Stonewt::Stonewt(double lbs) { mode = POUNDS; stone = (int)lbs / Lbs_per_stn; pds_left = (int)lbs % Lbs_per_stn + lbs - (int)lbs; pounds = lbs; } Stonewt::Stonewt(int stn, double lbs) { mode = POUNDS; stone = stn; pds_left = lbs; pounds = stn * Lbs_per_stn; } Stonewt::Stonewt() { mode = POUNDS; stone = pounds = pds_left = 0; } void Stonewt::SetMode(Mode form) { mode = form; } Stonewt operator+(const Stonewt &s1, const Stonewt &s2) { Stonewt s; if (s1.mode == POUNDS) { s.pounds = s1.pounds + s2.pounds; s.SetMode(POUNDS); } else { s.stone = s1.stone + s2.stone; s.SetMode(STONE); } return s; } Stonewt operator-(const Stonewt &s1, const Stonewt &s2) { Stonewt s; if (s1.mode == POUNDS) { s.pounds = s1.pounds - s2.pounds; s.SetMode(POUNDS); } else { s.stone = s1.stone - s2.stone; s.SetMode(STONE); } return s; } Stonewt operator*(const Stonewt &s1, const Stonewt &s2) { Stonewt s; if (s1.mode == POUNDS) { s.pounds = s1.pounds * s2.pounds; s.SetMode(POUNDS); } else { s.stone = s1.stone * s2.stone; s.SetMode(STONE); } return s; } std::ostream &operator<<(std::ostream &os, const Stonewt &s) { if (s.mode == POUNDS) os << s.pounds; else os << s.stone; return os; } //main函数#include "stonewt.h" int main() { Stonewt s1(10); Stonewt s2(10); std::cout << s1 << std::endl; std::cout << s2 << std::endl; std::cout << s1 + s2 << std::endl; std::cout << s1 - s2 << std::endl; std::cout << s1 * s2 << std::endl; system("pause");return 0; } /******************************************************************************************************************* Author : Cui mingyang Blog : cx_12586 Time : 2017/11/20 From : C++ Primer Plus第五版第11章编程练习 第6题 *******************************************************************************************************************/ //头文件#ifndef STONEWT_H_ #define STONEWT_H_ class Stonewt { private: enum{Lbs_per_stn = 14}; int stone; double pds_left; double pounds; public: Stonewt(double lbs); Stonewt(int stn, double lbs); Stonewt(); ~Stonewt(); void show_lbs() const; void show_stn() const; friend bool operator>(Stonewt &s1, Stonewt &s2); friend bool operator<(Stonewt &s1, Stonewt &s2); friend bool operator>=(Stonewt &s1, Stonewt &s2); friend bool operator<=(Stonewt &s1, Stonewt &s2); friend bool operator==(Stonewt &s1, Stonewt &s2); friend bool operator!=(Stonewt &s1, Stonewt &s2); }; #endif //头文件对应的cpp文件#include "stonewt.h" #include <iostream> Stonewt::Stonewt(double lbs) { stone = (int)lbs / Lbs_per_stn; pds_left = (int)lbs % Lbs_per_stn; pounds = lbs; } Stonewt::Stonewt(int stn, double lbs) { stone = stn; pds_left = lbs; pounds = stn * Lbs_per_stn + lbs; } Stonewt::Stonewt() { stone = 0;pounds = pds_left = 0.0; } Stonewt::~Stonewt() { } void Stonewt::show_stn() const { std::cout << stone << " stone, " << pds_left << " pounds\n"; } void Stonewt::show_lbs() const { std::cout << pounds << " pounds\n"; } bool operator>(Stonewt &s1, Stonewt &s2) { return s1.pounds > s2.pounds ? true : false; } bool operator<(Stonewt &s1, Stonewt &s2) { return s1.pounds < s2.pounds ? true : false; } bool operator>=(Stonewt &s1, Stonewt &s2) { return s1.pounds >= s2.pounds ? true : false; } bool operator<=(Stonewt &s1, Stonewt &s2) { return s1.pounds <= s2.pounds ? true : false; } bool operator==(Stonewt &s1, Stonewt &s2) { return s1.pounds == s2.pounds ? true : false; } bool operator!=(Stonewt &s1, Stonewt &s2) { return s1.pounds != s2.pounds ? true : false; } //main函数#include "stonewt.h" #include <iostream> int main() { Stonewt s[6] = {(10), (20), (30) }; for (int i = 3; i < 6; ++i) { double t; std::cin >> t; s[i] = Stonewt(t); } Stonewt min(999), max(-1), st11(11); int num = 0; for (int i = 0; i < 6; ++i) { min = min > s[i] ? s[i] : min; max = max < s[i] ? s[i] : max; if (s[i] >= st11) num++; } std::cout << "min: "; min.show_stn(); std::cout << "max: "; max.show_stn(); std::cout << ">=11: "; std::cout << num; system("pause"); return 0; } /******************************************************************************************************************* Author : Cui mingyang Blog : cx_12586 Time : 2017/11/20 From : C++ Primer Plus第五版第11章编程练习 第7题 *******************************************************************************************************************/ //头文件#ifndef Complex_H_#define Complex_H_using namespace std;class Complex{private:double real;double imag;public://构造函数和析构函数Complex();Complex(double x,double y);~Complex();//操作符重载Complex operator +(const Complex & c);Complex operator -(const Complex & c);Complex operator ~()const;Complex operator *(const Complex & c);friend Complex square(const Complex & z);friend Complex operator*(double n, const Complex & w);//输入输出操作符重载friend ostream & operator << (ostream & os, const Complex & c);friend istream & operator >> (istream & is, Complex & c);};#endif//头文件对应的cpp文件#include <iostream>#include <complex>#include "complex0.h"using namespace std;//构造函数和析构函数Complex::Complex(){real = imag =0;}Complex::Complex(double x,double y){real = x;imag = y;}Complex::~Complex(){}//操作符重载Complex Complex::operator +(const Complex & c){return Complex(real+c.real, imag+c.imag);}Complex Complex::operator -(const Complex & c){return Complex(real-c.real, imag-c.imag);}Complex Complex::operator ~()const{return Complex(real, -imag);}Complex Complex::operator *(const Complex & c){return Complex(real*c.real-imag*c.imag, real*c.imag+imag*c.real);}Complex square (const Complex & z){Complex sq;sq.real = z.real * z.real - z.imag * z.imag;sq.imag = 2.0 * z.real * z.imag;return sq;}Complex operator*(double n, const Complex & w){return Complex(n*w.real,n*w.imag);}//输入输出操作符重载ostream & operator << (ostream & os, const Complex & c){os << "(" << c.real << ", " << c.imag << "i)" <<endl;return os;}istream & operator >> (istream & is, Complex & c){cout << "real: ";if (is >> c.real){cout << "imaginary: ";is >> c.imag;}return is;}//main函数#include <iostream>#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 " << 2.0*c <<'\n';}cout << "Done\n";system("pause");return 0;}阅读全文
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