when we say "a member declated as protected is accessible to any class imediately derived from it" what does this mean. in the follwing example get_number function can be accessible by the result class , as per the statement it sould only be accessile to test class.

class student
{

protected:
    int roll_number;

public:

    void get_number(int){ cout<< "hello"; }
    void put_number(void) {cout<< "hello"; }
};

class test : public student
{

protected :
    float sub1;
    float sub2;

public:

void get_marks(float, float) {cout<< "hello"; roll_number  = 10; }

void put_marks(void) {cout<< "hello"; cout << "roll_number = " << roll_number  ; } 
};

class result :public test
{

    float total;

public:

    void display(){cout<< "hello"; roll_number  = 10; }
};

int main()
{

result student;

student.get_marks(2.2, 2.2);

student.put_marks();

return 0;

}

i changed the code as per the first statement the protected variable roll_number not be accessible upto the result class ?