[英]C++ compiler error base class issue
我得到這個->
錯誤 - 類型 'Ship' 不是 'CruiseShip' 的直接基礎 -
我想不明白。 這是我假設發生錯誤的地方。 我不確定我應該如何調用基類?
CruiseShip::CruiseShip(string n, string y, int p) : Ship(n,y)
CruiseShip.cpp
#include "CruiseShip.h"
#include "Ship.h"
#include <iostream>
using namespace std;
Ship s;
CruiseShip::CruiseShip(string n, string y, int p) : Ship(n,y)
{
passengers=p;
}
//A print function that overrides the print function in the base class.
//The CruiseShip class's print function should display only the ship's
//name and the maximum number of passengers.
void print()
{
cout<<"Name: "<<s.getName()<<"\nMaximum passengers:"<<passengers<<endl;
cout<<"-------------------------"<<endl;
}
CruiseShip.h
#ifndef CRUISESHIP_H
#define CRUISESHIP_H
#include <string>
using namespace std;
class Ship;
class CruiseShip{
private:
int passengers;
Ship::Ship s;
public:
CruiseShip(string, string, int);
virtual void print();
};
#endif
發送文件
#include "Ship.h"
#include <iostream>
using namespace std;
string name;
string built;
Ship::Ship(){
}
Ship::Ship(string n, string b)
{
name = n;
built = b;
}
//accessors and mutators methods
string getName()
{
return name;
}
string getBuilt()
{
return built;
}
//A virtual print function that displays
//the ship's name and the year it was built
void print()
{
cout<<"Name:"<<getName()<<"\nYear built:"<<getBuilt()<<endl;
cout<<"-------------------------"<<endl;
}
Ship.h
#ifndef SHIP_H
#define SHIP_H
#include <string>
using namespace std;
class Ship{
private:
string name;
string built;
public:
Ship();
Ship(string, string);
string getName();
string getBuilt();
virtual void print();
};
#endif
您需要從 Ship 派生 CruiseShip:
class CruiseShip : public Ship {
這個:
CruiseShip::CruiseShip(string n, string y, int p) : Ship(n,y)
^^^^^^^^^^^^
是一個基類構造函數調用,但您還沒有從 Ship 派生 CruiseShip,但編譯器知道 Ship 是一個類類型。
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