C++ primer plus中文编程练习答案第11章.docx

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1、C+ primer plus中文编程练习答案第11章1、 /vector.h #ifndef VECTOR_H_ #define VECTOR_H_ #include #include #include #include #include using namespace std; namespace VECTOR class Vector public: enum Mode RECT, POL ; private: double x; double y; double mag; doubleang; Mode mode; voidset_mag; voidset_ang; voidset_x;

2、 voidset_y; public: Vector; Vector(double n1, double n2, Mode form = RECT); void reset(double n1, double n2, Mode form = RECT); Vector; doublexvalconst return x; doubleyvalconst return y; doublemagvalconst return mag; doubleangvalconst return ang; voidpolar_mode; voidrect_mode; Vector operator+(cons

3、t 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); friendostream& operator(ostream&os, const Vector &v); ; #endif /vector.cpp #include vector.h namespace VECTOR const double Rad_to_deg

4、 = 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; else ang = 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, d

5、ouble 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 0n; x = y = mag = ang = 0.0; mode = RECT; void Vector:reset(double n1, double n2,

6、 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 0n; x = y = mag = ang = 0.0; mode = RECT; Vector:Vector void Vector:polar_mode mode = POL;

7、 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

8、*x, n*y); Vector operator*(double n, const Vector &a) return a*n; ostream&operator(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 ); else os Vector object mode is invalid; returnos; /randwalk.cpp #i

9、nclude vector.h int main using VECTOR:Vector; srand(time(0); double direction; Vector step; Vector result(0.0, 0.0); unsigned long steps = 0; double target; doubledstep; ofstreamfout; fout.open(savesteps.txt); cout target) coutdstep) break; fout Target Distance: target Step Size: dstependl; while (r

10、esult.magval target) fout steps : result endl; direction = rand % 360; step.reset(dstep, direction, Vector:POL); result = result + step; steps+; cout After steps steps, the subject has the following location:n; cout result endl; fout After steps steps, the subject has the following location:n; fout

11、result endl; result.polar_mode; cout orn result endl; cout Average outward distance per step = result.magval / steps endl; fout orn result endl; fout 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!

12、n; cin.clear; while (cin.get != n) continue; cin.get; return 0; 2、 /vector.h #ifndef VECTOR_H_ #define VECTOR_H_ #include #include #include #include using namespace std; namespace VECTOR class Vector public: enum Mode RECT, POL ; private: double x; double y; Mode mode; doubleset_magconst; doubleset_

13、angconst; voidset_x(double mag, double ang); voidset_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; doublexvalconst return x; doubleyvalconst return y; doublemagvalconst return set_mag; doubleangv

14、alconst return set_ang; voidpolar_mode; voidrect_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); friendostream& operator(ostream&os, const Vector &v); ; #

15、endif /vector.cpp #include vector.h namespace VECTOR const double Rad_to_deg = 45.0 / atan(1.0); double Vector:set_magconst returnsqrt(x * x + y * y); double Vector:set_angconst if (x = 0.0 & y = 0.0) return 0.0; else return atan2(y, x); void Vector:set_x(double mag, double ang) x = mag * cos(ang);

16、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 / Rad_to_deg); set_y(n1, n2 / Rad_to_deg); else cout Incorrect 3rd argu

17、ment to Vector - ; cout vector set to 0n; 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 / Rad_to_deg); set_y(n1, n2 / Rad_to_deg); else cout Incorrect 3rd argument to Vector - ; cout vector

18、 set to 0n; 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:operat

19、or-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; ostream&operator(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.set_m

20、ag , v.set_ang*Rad_to_deg ); else os Vector object mode is invalid; returnos; /randwalk.cpp #include vector.h int main using VECTOR:Vector; srand(time(0); double direction; Vector step; Vector result(0.0, 0.0); unsigned long steps = 0; double target; doubledstep; cout target) coutdstep) break; while

21、 (result.magval target) direction = rand % 360; step.reset(dstep, direction, Vector:POL); result = result + step; steps+; cout After steps steps, the subject has the following location:n; cout result endl; result.polar_mode; cout orn result endl; cout Average outward distance per step = result.magva

22、l / 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; cin.get; return 0; 3、 /vector.h #ifndef VECTOR_H_ #define VECTOR_H_ #include #include #include #include using namespace std; namespace VECTOR class Vecto

23、r public: enum Mode RECT, POL ; private: double x; double y; double mag; doubleang; Mode mode; voidset_mag; voidset_ang; voidset_x; voidset_y; public: Vector; Vector(double n1, double n2, Mode form = RECT); void reset(double n1, double n2, Mode form = RECT); Vector; doublexvalconst return x; doubley

24、valconst return y; doublemagvalconst return mag; doubleangvalconst return ang; voidpolar_mode; voidrect_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); fr

25、iendostream& operator(ostream&os, const Vector &v); ; #endif /vector.cpp #include vector.h 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; else ang = atan2(y, x); void Vector:set_x x = m

26、ag * 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 Incorr

27、ect 3rd argument to Vector - ; cout vector set to 0n; 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 / Rad_to_deg; set_x; set_y; else cout Incorrect 3rd a

28、rgument to Vector - ; cout vector set to 0n; 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 V

29、ector(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; ostream&operator(ostream&os, const Vector &v) if (v.mode = Vector:RECT) os (x,y) = ( v.x , v.y ); else

30、if (v.mode = Vector:POL) os (m,a) = ( v.mag , v.ang*Rad_to_deg ); else os Vector object mode is invalid; returnos; /randwalk.cpp #include vector.h int main using VECTOR:Vector; srand(time(0); double direction; Vector step; Vector result(0.0, 0.0); unsigned long steps = 0; double target; doubledstep;

31、 doublenumbers,N; double Min, Max, Sum, Average; cout target; coutdstep; cout numbers; N = numbers; Min = Max = Sum = Average = 0.0; while (numbers) while (result.magval target) direction = rand % 360; step.reset(dstep, direction, Vector:POL); result = result + step; steps+; cout After steps steps)

32、Min = steps; if (Max steps) Max = steps; Sum += steps; numbers-; steps = 0; result.reset(0.0, 0.0); Average = Sum / N; cout Max steps is Max endl; cout Min steps is Min endl; cout Average steps is Average endl; cout Bye!n; cin.clear; while (cin.get != n) continue; cin.get; return 0; 4、 /mytime.h #if

33、ndef MYTIME_H_ #define MYTIME_H_ #include #include #include using namespace std; class Time private: int hours; int minutes; public: Time; Time(int h, int m = 0); voidAddMin(int m); voidAddHr(int h); void Reset(int h = 0, int m = 0); Time operator*(double n)const; friend Time operator-(const Time &t

34、1, const Time &t2); friend Time operator+(const Time &t1, const Time &t2); friend Time operator*(double m, const Time &t) return t * m; friendostream& operator(ostream&os, const Time &t); ; #endif /mytime.cpp #include mytime.h Time:Time hours = minutes = 0; Time:Time(int h, int m) hours = h; minutes

35、 = 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 +

36、 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 = (tot1 - tot2) % 60; diff.hours = (tot1 - tot2) / 60; return diff; Time Time:operator*(doubl

37、e mult)const Time result; longtotalminutes = hours * mult * 60 + minutes * mult; result.hours = totalminutes / 60; result.minutes = totalminutes % 60; return result; ostream&operator(ostream&os, const Time &t) ost.hours hours, t.minutes minutes; returnos; /usetime.cpp #include mytime.h int main Time

38、 aida(3, 35); Time tosca(2, 48); Time temp; cout Aida and Tosca:n; coutaida ; toscaendl; temp = aida + tosca; cout Aida + Tosca: temp 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 * toscaendl; cin.get; return 0; 5、 /

39、stonewt.h #ifndef STONEWT_H_ #define STONEWT_H_ #include #include #include using namespace std; classStonewt public: enum Mode STN, INPD, FPD ; private: staticintconstLbs_per_stn = 14; int stone; doublepds_left; double pounds; intpounds_int; Mode mode; voidset_stn; voidset_pds; voidset_pds_int; publ

40、ic: Stonewt(double lbs, Mode form); Stonewt(intstn, double lbs, Mode form); Stonewt; Stonewt; voidstn_mode; voidpds_mode; voidint_pds_mode; operatorintconst; operator doubleconst; Stonewt operator+(constStonewt&st)const; Stonewt operator-(constStonewt&st)const; Stonewt operator*(double n)const; friendStonewt operator*(double n, constStonewt&st); friendostream&operator(ostream&os, constStonewt&st); ; #endif /stonewt.cpp #includ