C++ see declaration of錯誤 純虛函數(shù)問題
#include
class vehicle
{
protected:
double weight;
double vaule;
public:
vehicle(double weight,double vaule)
{
vehicle::weight=weight;
vehicle::vaule=vaule;
}
virtual double weight()=0;
virtual double vaule()=0;
};
class car:public vehicle
{
public:
car(double weight,double vaule):vehicle(weight,vaule){};
double weight()
{
return weight;
}
double vaule()
{
return vaule;
}
};
class truck:public vehicle
{
public:
truck(double weight,double vaule):vehicle(weight,vaule){};
double weight()
{
return weight;
}
double vaule()
{
return vaule;
}
};
class boat:public vehicle
{
public:
boat(double weight,double vaule):vehicle(weight,vaule){};
double weight()
{
return weight;
}
double vaule()
{
return vaule;
}
};
void main()
{
vehicle *p;
car c1(1000.0,20000.0);
truck t1(3000.0,100000.0);
boat b1(9000.0,2000000.0);
p=&c1;
cout