C++ Primer Plus 学习笔记第十三章类继承-蒲公英云

C++ Primer Plus 学习笔记第十三章类继承

继承格式

class A ：parent B

{

}

派生类要有自己的构造函数

可以根据需要添加额外的数据成员和成员函数

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继承的例子：

tabtenn1.h

#ifndef TABTENN1_H_
#define TABTENN1_H_
#include <string>
using std::string;
class TableTennisPlayer
{
  private:
    string firstname;
    string lastname;
    bool hasTable;
  public:
    TableTennisPlayer(const string & fn = "none",
                      const string & ln = "none", bool ht = false);
    void Name() const;
    bool HasTable() const {return hasTable;}
    void ResetTable(bool v) {hasTable = v;}
};
class RatedPlayer : public TableTennisPlayer
{
  private:
    unsigned int rating;
  public:
    RatedPlayer (unsigned int r = 0, const string & fn = "none",
                  const string & ln = "none", bool ht = false);
    RatedPlayer (unsigned int r, const TableTennisPlayer & tp);
    unsigned int Rating() const { return rating;}
    void ResetTable (unsigned int r) {rating = r;}
};
#endif

tabtenn1.cpp

#include "tabtenn1.h"
#include <iostream>
TableTennisPlayer::TableTennisPlayer(const string & fn,
  const string & ln, bool ht) : firstname(fn),
      lastname(ln), hasTable(ht) {}
void TableTennisPlayer::Name() const
{
  std::cout << lastname << ", " << firstname;
}
RatedPlayer::RatedPlayer(unsigned int r, const string & fn,
      const string & ln, bool ht) : TableTennisPlayer(fn, ln, ht)
{
  rating = r;
}
RatedPlayer::RatedPlayer(unsigned int r, const TableTennisPlayer & tp)
  : TableTennisPlayer(tp), rating(r)
  {
  }

usett1.cpp

#include <iostream>
#include "tabtenn1.h"
int main(void)
{
  using std::cout;
  using std::endl;
  TableTennisPlayer player1("Tara", "Boomdea", false);
  RatedPlayer rplayer1(1140, "Mallory", "Duck", true);
  rplayer1.Name();
  if (rplayer1.HasTable())
    cout << ": has a table.\n";
  else
    cout << ": hasn't a table.\n";
  player1.Name();
  if (player1.HasTable())
    cout << ": has a table";
  else
    cout << ": hasn't a table.\n";
  cout << "Name: ";
  rplayer1.Name();
  cout << "; Rating: " << rplayer1.Rating() << endl;
  RatedPlayer rplayer2(1212, player1);
  cout << "Name: ";
  rplayer2.Name();
  cout << "; Rating: " << rplayer2.Rating() << endl;
  return 0;
}