C++ see declaration of错误 纯虚函数问题
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C++ see declaration of错误 纯虚函数问题
#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
#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
程序中变量和函数用了同样的名字weight和vaule
你return weight的时候,编译器不知道你是要返回变量weight还是返回weight函数的指针强制转double.
变量换个名字吧.比如mWeight,mValue
你return weight的时候,编译器不知道你是要返回变量weight还是返回weight函数的指针强制转double.
变量换个名字吧.比如mWeight,mValue
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