如何导入多个派生类标题（没有收到错误）？
我有一个基类船。我有2个派生类，货物和游轮。在我的主要课程中，我尝试导入cargoship和cruiseship的头文件。如果我同时导入两者，我会收到错误;如果我导入一个，没有错误。
我尝试多次导入：
include "CruiseShip.h"
include "Cargoship.h"
错误列表：
1>c:\users\cory\source\repos\project33\project33\ship.h(7): error C2011: 'Ship': 'class' type redefinition
1>c:\users\cory\source\repos\project33\project33\ship.h(7): note: see declaration of 'Ship'
1>c:\users\cory\source\repos\project33\project33\cargoship.h(7): error C2504: 'Ship': base class undefined
我的船基类：
#include "Ship.h"
Ship::Ship() {
}
Ship::~Ship() {
}
Ship::Ship(string name, string year) : shipName(name), shipYear(year) {
}
string Ship::getShipName() {
return shipName;
}
string Ship::getShipYear() {
return shipYear;
}
void Ship::setShipName(string name) {
shipName = name;
}
void Ship::setShipYear(string year) {
shipYear = year;
}
string Ship::print() const {
return "Ship Name: " + shipName + " \nYear Built: " + shipYear;
}