(クラスの) 4 つのヘッダー ファイルを作成しましたが、そのうち 3 つのクラス (Customer、GoldCustomer、PlatinumCustomer) が正常にコンパイルされました。GoldCustomer と PlatinumCustomer は Customer の派生 (継承) ですが、問題の MovieTicket クラスは他の 3 つのクラスすべての合成です。これは、継承と構成を示すという課せられた要件に従うことです。
MovieTicket をコンパイルすると、これらのエラーが発生します。誰でも調べて説明するのを手伝ってもらえますか? クラスの宣言が重複しているようです（Googleで読んだ限りでは、ヘッダーファイルにクラスをインクルードし、ヘッダーガードを入れればエラーは出ません）。もう 1 つのことは、クラスの配列でエラーが発生することです...理由がわかりません
In file included from class_GoldCustomer.hpp:3:0, from class_MovieTicket.hpp:5:
class_Customer.hpp:11:7: error: redefinition of ‘class Customer’
In file included from class_MovieTicket.hpp:4:0:
class_Customer.hpp:11:7: error: previous definition of ‘class Customer’
In file included from class_PlatinumCustomer.hpp:3:0,
from class_MovieTicket.hpp:6: class_Customer.hpp:11:7:
error: redefinition of ‘class Customer’
In file included from class_MovieTicket.hpp:4:0: class_Customer.hpp:11:7:
error: previous definition of ‘class Customer’
class_MovieTicket.hpp:29:22: error: expected ‘]’ before ‘;’ token
class_MovieTicket.hpp:29:25: error: expected unqualified-id before ‘]’ token
class_MovieTicket.hpp:32:26: error: expected ‘]’ before ‘;’ token
class_MovieTicket.hpp:32:29: error: expected unqualified-id before ‘]’ token
class_MovieTicket.hpp: In member function
‘void MovieTicket::newMovie(int, std::string, std::string, int, int, float)’:
class_MovieTicket.hpp:53:3: error: ‘ListGold’ was not declared in this scope
class_MovieTicket.hpp:53:12: error: expected ‘]’ before ‘;’ token
class_MovieTicket.hpp:53:15: error: expected primary-expression before ‘]’ token
class_MovieTicket.hpp:53:15: error: expected ‘;’ before ‘]’ token
class_MovieTicket.hpp:54:3: error: ‘ListPlat’ was not declared in this scope
class_MovieTicket.hpp:54:12: error: expected ‘]’ before ‘;’ token
class_MovieTicket.hpp:54:15: error: expected primary-expression before ‘]’ token
class_MovieTicket.hpp:54:15: error: expected ‘;’ before ‘]’ token
class_MovieTicket.hpp: In member function ‘void MovieTicket::Purchase()’:
class_MovieTicket.hpp:103:4: error: ‘ListGold’ was not declared in this scope
class_MovieTicket.hpp:108:4: error: ‘ListPlat’ was not declared in this scope
Compilation failed.
以下にコードを示します。
class_Customer.hpp
#include <iostream>
#include <string>
//header guard
#ifndef CUSTOMER_H
#define CUSTOMER_H
using namespace std;
class Customer {
protected:
//data members
int id;
string type;
int sold;
//public:
//constructor and destructor
Customer(){
type = "non member"; //default this customer class as 'non member'
sold = 0;
}
~Customer(){}
//functions member
void setID(int inputID){ //set ID of the customer
id = inputID;
}
int getSold(){ //get no. of sold
return sold;
}
};
#endif[/CODE]
class_GoldCustomer.hpp
#include <iostream>
#include <string>
#include "class_Customer.hpp"
using namespace std;
//header guard
#ifndef GOLDCUSTOMER_H
#define GOLDCUSTOMER_H
class GoldMember : protected Customer{
private:
//data members
int gold_id;
int annual_fee;
float discount;
public:
//constructor and destructor
GoldMember(){
type = "gold";
sold = 0;
annual_fee = 10;
discount = 0.1;
}
~GoldMember(){}
//functions member
int getAnnualFee(){ //get annual fee
return annual_fee;
}
float getDiscount(){ //get discount
return discount;
}
};
#endif[/CODE]
class_PlatinumCustomer.hpp
#include <iostream>
#include <string>
#include "class_Customer.hpp"
#define POINT 5; //how many ticket purchased needed to eligible for one free ticket
using namespace std;
//header guard
#ifndef PLATINUMCUSTOMER_H
#define PLATINUMCUSTOMER_H
class PlatinumMember : protected Customer{
private:
//data members
int plat_id;
int annual_fee;
float discount;
int redeem_point = 0; //count the tickets purchased as 'points'
public:
//constructor and destructor
PlatinumMember(){
type = "gold";
sold = 0;
annual_fee = 50;
discount = 0.2;
redeem_point = 0;
}
~PlatinumMember(){}
//functions member
int getAnnualFee(){ //get annual fee
return annual_fee;
}
float getDiscount(){ //get discount
return discount;
}
int getFRedeemPoint(){ //get redeem point
return redeem_point;
}
int getFreeTicket(){ //get no. of free tickets based on redeem point
int result;
result = redeem_point/POINT;
return result;
}
};
#endif[/CODE]
最後に、コンパイルに失敗しました:
class_MovieTicket.hpp
#include <iostream>
#include <string>
#include "class_Customer.hpp"
#include "class_GoldCustomer.hpp"
#include "class_PlatinumCustomer.hpp"
//header guard
#ifndef MOVIETICKET_H
#define MOVIETICKET_H
using namespace std;
#define MAX 20; //no of tickets per movie hall available
class MovieTicket {
private:
int movie_id;
string movie_title;
string date;
int hall_no;
int seat_no;
float ori_price;
int NonMemberCount;
GoldMember ListGold[MAX];
int GoldMemberCount;
PlatinumMember ListPlat[MAX];
int PlatMemberCount;
static int AvailTicket;
static int SoldTicket;
public:
//constructor and destructor
MovieTicket(){};
~MovieTicket(){};
//functions member
void newMovie(int inputMovieID, string inputTitle,
string inputDate, int inputHall, int inputSeat, float inputPrice){
movie_id = inputMovieID;
movie_title = inputTitle;
date = inputDate;
hall_no = inputHall;
seat_no = inputSeat;
ori_price = inputPrice;
ListGold[MAX] = {0};
ListPlat[MAX] = {0};
AvailTicket = MAX;
SoldTicket = 0;
}
int getAvailTicket(){
return AvailTicket;
}
int getSoldTicket(){
return SoldTicket;
}
void Purchase(){
int no_of_ticket;
int membership;
int Inputgold_id;
int Inputplat_id;
cout <<"Enter Movie ID?" << endl;
cin >> movie_id;
cout << endl << "How many ticket?" << endl;
cin >> no_of_ticket;
cout << endl << "Enter membership? 1. Non 2. Gold 3.Plat" << endl;
cin >> membership;
this->SoldTicket += no_of_ticket;
this->AvailTicket = MAX - this->SoldTicket;
if (membership == 2){
cout << "Enter your Gold Membership ID?" << endl;
cin >> Inputgold_id;
GoldMember Inputgold_id;
//create a Gold customer class with 'ID' as the name
}
else if (membership == 3){
cout << "Enter your Platinum Membership ID?" << endl;
cin >> Inputplat_id;
PlatinumMember Inputplat_id;
//create a Plat customer class with 'ID' as the name
}
switch (membership){
case 1:
NonMemberCount++;
break;
case 2:
GoldMemberCount++;
ListGold[GoldMemberCount] = Inputgold_id;
break;
case 3:
PlatMemberCount++;
ListPlat[PlatMemberCount] = Inputplat_id;
break;
}
}
};
#endif[/CODE]
p/s: 長文すみません。