#include <iostream>
using namespace std;
 
class Vehicle {
public:  
    virtual void show() { cout<<"I'm a vehicle"<<endl; }   // virtual
    void print() { cout <<"I'm a vehicle"<<endl; }         // not virtual
    void invokeshow() { show(); }                          // not virtual but invoking virtual
    void invokespecificshow() { Vehicle::show(); }         // not virtual invoking specific
    ~Vehicle() {}                                //at least one virtual ?  then virtual destructor
}; 
 
class Motorcycle: public Vehicle {
public:  
    void show() override { cout<<"I'm a motorcycle"<<endl; }
    void print() { cout <<"I'm a motorcycle"<<endl; }
}; 
 
void test(Vehicle &v) {
	v.show(); 
	v.print();
	v.invokeshow(); 
	v.invokespecificshow(); 
}
 
int main() {
	Motorcycle mt; 
	test(mt);
	return 0;
}

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