C ++ Primer Plus (6th) Chapter 1 programming question 2, primer Chapter 2

C ++ Primer Plus (6th) Chapter 1 programming question 2, primer Chapter 2
Chapter 2 class inheritance 13th second question of programming exercises

1 header file source code: "classic. h"

 1 #ifndef CLASSIC_H_INCLUDED 2 #define CLASSIC_H_INCLUDED 3  4 class Cd 5 { 6 private: 7     char *performers; 8     char *label; 9     int selections;10     double playtime;11 public:12     Cd(char * s1, char * s2, int n, double x);13     Cd();14     Cd(const Cd & C);15     virtual ~Cd();16     virtual void Report() const;17     Cd & operator=(const Cd &d);18 };19 20 class Classic : public Cd21 {22 private:23     char *details;24 public:25     Classic(char * s0, char * s1, char * s2, int n, double x);26     Classic() {}27     Classic(const Classic & C);28     Classic(char * s0, const Cd  & d);29     ~Classic();30     virtual void Report() const;31     Classic & operator=(const Classic & C);32 33 };34 35 #endif // CLASSIC_H_INCLUDED

 

2 header file implementation:

  1 #include <iostream>  2 #include <cstring>  3 #include "classic.h"  4   5 using std::cout;  6 using std::endl;  7   8 Cd::Cd(char * s1, char * s2, int n, double x)  9 { 10     int len1 = std::strlen(s1); 11     int len2= std::strlen(s2); 12     performers = new char[len1+1]; 13     label = new char[len2+1]; 14     std::strcpy(performers, s1); 15     std::strcpy(label, s2); 16     selections = n; 17     playtime = x; 18 } 19  20 Cd::Cd() 21 { 22     performers = 0; 23     label = 0; 24     selections = 0; 25     playtime = 0.0; 26 } 27  28 Cd::Cd(const Cd & C) 29 { 30     int len1 = std::strlen(C.performers); 31     int len2= std::strlen(C.label); 32     performers = new char[len1+1]; 33     label = new char[len2+1]; 34     std::strcpy(performers, C.performers); 35     std::strcpy(label, C.label); 36     selections = C.selections; 37     playtime = C.playtime; 38 } 39 Cd::~Cd() 40 { 41     delete [] performers; 42     delete [] label; 43 } 44  45 void Cd::Report() const 46 { 47     cout << "performers: " << performers << endl; 48     cout << "label: " << label << endl; 49     cout << "selection: " << selections << endl; 50     cout << "playtime: " << playtime << endl; 51  52 } 53  54 Cd & Cd::operator=(const Cd &C) 55 { 56     if(this == &C) 57         return *this; 58     int len1 = std::strlen(C.performers); 59     int len2= std::strlen(C.label); 60     performers = new char[len1+1]; 61     label = new char[len2+1]; 62     std::strcpy(performers, C.performers); 63     std::strcpy(label, C.label); 64     selections = C.selections; 65     playtime = C.playtime; 66     return *this; 67 } 68  69  70 Classic::Classic(char * s0, char * s1, char * s2, int n, double x):Cd(s1, s2, n, x) 71 { 72     int len = std::strlen(s0); 73     details = new char[len+1]; 74     std::strcpy(details, s0); 75 } 76  77  78  79 Classic::Classic(char * s0, const Cd &C):Cd(C) 80 { 81     details = new char[std::strlen(s0)+1]; 82     std::strcpy(details, s0); 83 } 84  85 Classic::Classic(const Classic & C):Cd(C) 86 { 87     int len = std::strlen(C.details); 88     details = new char[len+1]; 89     std::strcpy(details, C.details); 90 } 91  92 Classic::~Classic() 93 { 94     delete [] details; 95 } 96  97 void Classic::Report() const 98 { 99     Cd::Report();100     cout << "details: " << details << endl;101 }102 103 Classic & Classic::operator=(const Classic & C)104 {105     if(this == &C)106         return *this;107     Cd::operator=(C);108     delete [] details;109     int len = std::strlen(C.details);110     details = new char[len+1];111     std::strcpy(details, C.details);112     return *this;113 }