member function of one class can be friend function of another class

[Tanushreeagr]

How to make a member function of one class , the friend function of another class:


class car
{
private:
int speed;

char color[20];

public:

void input()
{
cin >> color >> speed;
}

void display(car c)// Member function of Class car, which i want to make friend function for Class Scooter
{
cout << c.color << endl << c.speed;
}
};


class scooter
{

public:
int input_i()
{
cin >> color >> speed;
}
friend void car:isplay(scooter); // I am trying to make the member function display() of Class car , friend function for Class scooter.
};

void display(scooter s)
{
cout << s.color << s.speed;// compiler error color and speed undeclared.

}

// I want to make color and speed visible in Scooter class my making display function , friend function of class scooter.

void main()
{
car c1;
scooter s1;

c1.input();

s1.input_i();

c1.display(c1);

s1.display(s1);

}

[In the above program i want to make the member function display() of class Car , the friend function for class Scooter, so that class scooter can access private data members(speed and color) of class Car.]


But i think there's a mistake in above coding , so please help me how i could do this, as compiler error: nonexistent function 'car:isplay' specified as friend

THANKS.....