弄成虚基类后就出现好多错误= =读不懂错误原因，怎么读懂
#include<iostream>using namespace std;
class vehicle
{protected:
int wheel;
int weight;
public:
vehicle(int i,int j)
{
wheel=i;
weight=j;
}
void display()
{
cout<<wheel<<endl;
cout<<weight<<endl;
}
};
class car:virtual public vehicle
{protected:
int passengers;
public:
car(int wh,int we,int p):vehicle(wh,we)
{
passengers=p;
}
void display()
{
cout<<wheel<<endl;
cout<<weight<<endl;
cout<<passengers<<endl;
}
};
class truck:virtual public vehicle
{protected:
double payload;
public:
truck(int wh,int we,double pay):vehicle(wh,we)
{
payload=pay;
}
void display()
{
vehicle::display();
cout<<payload<<endl;
}
};
class car_truck:public vehicle,public car,public truck
{protected:
int flag;
public:
car_truck(wh1,we1,p1,f):vehicle(wh1,we1,p1,f):car(wh1,we1,p1,f):truck(wh1,we1,p1,f)
{
flag=f;
}
void display()
{
if(flag==0)
{
cout<<"this is a car"<<endl;
car::display();
}
else
{
cout<<"this is a truck"<<endl;
truck::display();
}
}
};
int main()
{
vehicle v(3,4);
v.display();
car c(3,4,5);
c.display();
truck t(3,4,8.4);
t.display();
car_truck ct(3,4,5,0);
ct.display();
return 0;
}
//Compiling...
.cpp
E:\dingzhw\dze\.cpp(51) : error C2584: 'car_truck' : direct base 'vehicle' is inaccessible; already a base of 'car'
E:\dingzhw\dze\.cpp(4) : see declaration of 'vehicle'
E:\dingzhw\dze\.cpp(52) : error C2584: 'car_truck' : direct base 'vehicle' is inaccessible; already a base of 'truck'
E:\dingzhw\dze\.cpp(4) : see declaration of 'vehicle'
E:\dingzhw\dze\.cpp(55) : error C2629: unexpected 'class car_truck ('
E:\dingzhw\dze\.cpp(55) : error C2334: unexpected token(s) preceding ':'; skipping apparent function body
E:\dingzhw\dze\.cpp(82) : error C2660: 'car_truck::car_truck' : function does not take 4 parameters
执行 cl.exe 时出错.
dze.exe - 1 error(s), 0 warning(s)
