问答题

已知交通工具类定义如下。
要求：(1)实现这个类；(2)定义并实现一个小车类car，是它的公有派生类，小车本身的私有属性有载人数，小车的函数有init(设置车轮数，重量和载人数)，getpassenger(获取载人数)，print(打印车轮数，重量和载人数)。
class vehicle
{ protected:
int wheels;//车轮数
float weight;//重量
public:
void init( int wheels, float weight);
int get_wheels();
float get_weight ();
void print();
};
void vehicle::init( int wheels, float weight)
{ this - ＞ wheels = wheels;
this - ＞ weight = weight;
cout ＜＜ wheels ＜＜ endl;
}
int vehicle::get_wheels()
{ return wheels; }
float vehicle::get_weight ()
{ return weight;}
void vehicle::print()
{ cout ＜＜ "车轮数:" ＜＜ wheels ＜＜ "," ＜＜ "重量:" ＜＜ weight ＜＜ endl; }