how to inherit attributes from one class to another?

[denniscpp]

im having some trouble inheriting attributes from a class. my code:

#include <iostream>
#include <vector>
#include <cstdlib>
#include <set>
#include <algorithm>
using namespace std;

class student
{
private:
	string name, dummy, status;
	char gender;
	int ID;
public:
	student() : name("UNKNOWN"), ID(0), gender('-'), status("UNASSIGNED"){}
	student (string Name, int ID, char Gender)
	{
		this->name = Name;
		this->ID = ID;
		this->gender = Gender;
	}
	student(const student& s): name(s.name), ID(s.ID), gender(s.gender){}
	void setstudent();
	void setstatus(string status) {this->status = status;}
	void print(int i) const;
	int getid(){return ID;}
};

void student::setstudent()
{
	cout << "Enter student's ID: ";
	cin >> ID;
	cout << "Enter student's gender (M/F): ";
	cin >> gender;
	gender = toupper(gender);
	getline(cin, dummy);
	cout << "Enter student's name: ";
	getline(cin, name);
}

void student::print(int i) const
{
	cout << i+1 << ". ID: " << ID << " | NAME: " << name << 
	" l SEX: " << gender << " l ROOM: " << status << endl;
}

class room
{	
private:
	vector<student*> students;
	vector<student*>::iterator it;
public:
	void addstudent(student* s);
	void delstudent (int target);
	void printALL();;
	int studentsize(){return students.size();}
};

void room::addstudent(student* s)
{
	students.push_back(s);
}

void room::delstudent(int target)
{
	students.erase(students.begin()+target);
}

void room::printALL()
{	
	for(int i = 0; i < students.size(); i++)
		students[i]->print(i);
}

class MA:public student, public room
{
	vector<student*> MA1;
	vector<student*> MA2;
	vector<student*> MA3;
	vector<student*> MA4;
	vector<student*> MA5;
	vector<student*> MA6;
	vector<student*> MA7;
	vector<student*> MA8;	
	
public:
	void addMA1(int target);
	void addMA2(int target);
	void addMA3(int target);
	void addMA4(int target);
	void addMA5(int target);
	void addMA6(int target);
	void addMA7(int target);
	void addMA8(int target);
	void delMA1(int target);
	void printMA1();
	int roomMA1size(){return MA1.size();}
};

void MA::addMA1(int target)
{
	MA1.push_back(students[target]);
}

void MA::delMA1(int target)
{
	MA1[target]->setstatus("UNASSIGNED");
	students.push_back(MA1[target]);
	MA1.erase(MA1.begin()+target);
}

void MA::addMA2(int target)
{
	MA2.push_back(students[target]);
	students[target]->setstatus("MA1");
	students.erase(students.begin()+target);
}

void MA::addMA3(int target)
{
	MA3.push_back(students[target]);
	students[target]->setstatus("MA1");
	students.erase(students.begin()+target);
}

void MA::addMA4(int target)
{
	MA4.push_back(students[target]);
	students[target]->setstatus("MA1");
	students.erase(students.begin()+target);
}

void MA::addMA5(int target)
{
	MA5.push_back(students[target]);
	students[target]->setstatus("MA1");
	students.erase(students.begin()+target);
}

void MA::addMA6(int target)
{
	MA6.push_back(students[target]);
	students[target]->setstatus("MA1");
	students.erase(students.begin()+target);
}

void MA::addMA7(int target)
{
	MA7.push_back(students[target]);
	students[target]->setstatus("MA1");
	students.erase(students.begin()+target);
}

void MA::addMA8(int target)
{
	MA8.push_back(students[target]);
	students[target]->setstatus("MA1");
	students.erase(students.begin()+target);
}

void MA::printMA1()
{
	for(int i = 0; i < MA1.size(); i++)
		MA1[i]->print(i);
}


void mainmenu()
{
	cout << "*===========================================*" << endl <<
	"|[1] add students                           |" << endl <<
	"|[2] delete student                         |" << endl <<
	"|[3] assign rooms                           |" << endl <<
	"|[4] empty rooms                            |" << endl <<
	"|[5] List students                          |" << endl <<
	"|[6] Exit                                   |" << endl <<
	"*===========================================+" << endl << endl << endl;
}

void MAmenu()
{
    cout << "*===========================================*" << endl <<
	"|[1] MA1                                            |" << endl <<
	"|[2] MA2                                            |" << endl <<
	"|[3] MA3                                            |" << endl <<
	"|[4] MA4                                            |" << endl <<
	"|[5] MA5                                            |" << endl <<
	"|[6] MA6                                            |" << endl <<
	"|[7] MA7                                            |" << endl <<
	"|[8] MA8                                            |" << endl <<
	"|[9] back                                           |" << endl <<
	"*===========================================+" << endl << endl << endl;
}

	room r1;
	MA a;
	student* s1 = NULL;
	int target;
	int num;
	bool done = false;
	char choice, option;
	
int main()
{
	do
	{
		mainmenu();
		cout << "Select option (1-6): ";
		cin >> option;
		option = toupper(option);
		switch (option)
		{
			case '1' : 
			cout << "Add student? (Y/N):";
			cin >> choice;
	
			while (toupper(choice) == 'Y')
			{
				s1 = new student;		
				s1->setstudent();
				r1.addstudent(s1);		
				cout << "add more students?(Y/N): ";
				cin >> choice;
			}
			r1.printALL();
			break;
			
			case '2' : 
			cout << "Delete student? (Y/N):";
			cin >> choice;
			r1.printALL();
	
			while (toupper(choice) == 'Y')
			{
				cout << "select a student(1-" << r1.studentsize() << "): ";
				cin >> target;
				target--;
							
				r1.delstudent(target);
							
				cout << "Delete more students?(Y/N): ";
				cin >> choice;
				r1.printALL();
			};
			 break;
			 
			case '3' : ;
			cout << "Assign to room? (Y/N):";
			cin >> choice;
			r1.printALL();
			num = 2;
						
			while (toupper(choice) == 'Y' && num > a.roomMA1size())
			{
				cout << "choose student(1-" << r1.studentsize() << "): ";
				cin >> target;
				target--;
						
				a.addMA1(target);
						
				cout << "Assign more?(Y/N): ";
				cin >> choice;
				r1.printALL();
				a.printMA1();
			};
				cout << "capacity reached\n\n";
				system("pause");
				break;
				
			case '4' : 
			cout << "Unassign room? (Y/N):";
			cin >> choice;
			a.printMA1();
						
			while (toupper(choice) == 'Y' && num > 0)
			{
				cout << "choose student: ";
				cin >> target;
				target--;
						
				a.delMA1(target);
						
				cout << "Assign more?(Y/N): ";
				cin >> choice;
				a.printMA1();
					
				num--;
			}
				if (num == 0)
				cout << "room empty\n\n";
				system("pause");	
				break;
			
			case '5' : 
			r1.printALL();
			break;		
		}
	}
	while(!done);

	return 0;
}

whenever a.addMA1() is ran, the program crashed.. im guessing it's because students[target] does not exist in class MA. so how do i make it so that it exist for all class?

[Zhuge]

You should make members you want accessible in derived classes protected instead of private.