C++ 派生类

定义派生类的基类

tabtenn.h

  1. #ifndef PRO1_TABTENN_H
  2. #define PRO1_TABTENN_H
  4. class TableTennisPlayer {
  5. private:
  6.     enum {LIM = 20};
  7.     char firstname[LIM];
  8.     char lastname[LIM];
  9.     bool hasTable;
  10. public:
  11.     TableTennisPlayer(const char* fn = "none", const char* ln = "none", bool ht = false);
  12.     void Name()const ;
  13.     bool HasTable()const { return hasTable;};
  14.     void ResetTable(bool v){hasTable = v;};
  15. };
  17. #endif //PRO1_TABTENN_H

tabtenn.cpp

  1. #include "tabtenn.h"
  2. #include <iostream>
  3. #include <cstring>
  5. using namespace std;
  7. TableTennisPlayer::TableTennisPlayer(const char *fn, const char *ln, bool ht) {
  8.     strncpy(firstname, fn, LIM - 1);
  9.     firstname[LIM - 1] = '\0';
  10.     strncpy(lastname, ln, LIM -1);
  11.     lastname[LIM - 1] = '\0';
  12.     hasTable = ht;
  13. }
  15. void TableTennisPlayer::Name() const {
  16.     cout << lastname << " , " << firstname;
  17. }

main.cpp

  1. #include <iostream>
  2. #include "module6_extends/tabtenn.h"
  4. using namespace std;
  6. void usett(){
  7.     TableTennisPlayer player1("Chuck", "Blizzard", true);
  8.     TableTennisPlayer player2("Tara", "Boomdea", false);
  9.     player1.Name();
  10.     if (player1.HasTable()) {
  11.         cout << ":has a table.\n";
  12.     } else{
  13.         cout << ":has't a table.\n";
  14.     }
  15.     player2.Name();
  16.     if (player2.HasTable()) {
  17.         cout << ":has a table.\n";
  18.     } else{
  19.         cout << ":has't a table.\n";
  20.     }
  21. }
  23. int main() {
  24.     usett();
  25.     return 0;
  26. }

使用派生类

tabtenn.h

  1. class RatedPlayer:public TableTennisPlayer{
  2. private:
  3.     unsigned int rating;
  4. public:
  5.     RatedPlayer(unsigned int r = 0, const char* fn = "none", const char* ln = "none", bool ht = false);
  6.     RatedPlayer(unsigned int r, const TableTennisPlayer & tp);
  7.     unsigned int Rating(){ return rating; }
  8.     void ResetRating(unsigned int r){rating = r;}
  9. };

tabtenn.cpp

  1. RatedPlayer::RatedPlayer(unsigned int r, const char *fn, const char *ln, bool ht):TableTennisPlayer(fn, ln, ht){
  2.     rating = r;
  3. }
  5. RatedPlayer::RatedPlayer(unsigned int r, const TableTennisPlayer &tp):TableTennisPlayer(tp), rating(r) {}

main.cpp

  1. #include <iostream>
  2. #include "module6_extends/tabtenn.h"
  4. using namespace std;
  6. void usett(){
  7.     TableTennisPlayer player1("Chuck", "Blizzard", true);
  8.     TableTennisPlayer player2("Tara", "Boomdea", false);
  9.     RatedPlayer ratedPlayer(1140, "Mallory", "Duck", true);
  10.     ratedPlayer.Name();
  11.     if (ratedPlayer.HasTable()) {
  12.         cout << ":has a table.\n";
  13.     }else{
  14.         cout << ":has't a table.\n";
  15.     }
  16.     player1.Name();
  17.     if (player1.HasTable()) {
  18.         cout << ":has a table.\n";
  19.     } else{
  20.         cout << ":has't a table.\n";
  21.     }
  22.     player2.Name();
  23.     if (player2.HasTable()) {
  24.         cout << ":has a table.\n";
  25.     } else{
  26.         cout << ":has't a table.\n";
  27.     }
  28.     cout << "Name: ";
  29.     ratedPlayer.Name();
  30.     cout << ":Rating: " << ratedPlayer.Rating() << endl;
  31.     RatedPlayer ratedPlayer1(1221, player1);
  32.     cout << "Name: ";
  33.     ratedPlayer1.Name();
  34.     cout << ":Rating :" << ratedPlayer1.Rating() << endl;
  35. }
  37. int main() {
  38.     usett();
  39.     return 0;
  40. }