class Student
{
public:
	int age;
};

class StudentGroup
{
public:
	Student *students;
};


void main()
{
	Student st1;
	st1.age = 18;
	Student st2;
	st2.age = 21;

	StudentGroup p21v2;
	p21v2.students = new Student[2];
	p21v2.students[1] = st1;
	p21v2.students[2] = st2;
	cout<<p21v2.students[1].age<<"\n";
	cout<<p21v2.students[2].age<<"\n";
	system("pause");
}

class StudentGroup
{
public:
	Student *students;
	int countStudents(Student* stPointer)
	{
		int objCount;
                //вот какой тут цикл писать? :)
		return objCount;
	}
};

class StudentGroup
{
private:
	Student *students;

class student
{
	
	public:

	char name[SIZE];
	int age;

	student(char n[SIZE]="", int a=16)
	{
	strcpy(name, n);
	age = a;
	}

	~student(){}

	void print()
	{
	cout<< name<<age<<'\n';
	}
};

class group
{
	int groupID;
	int startYear;
	int students;
	student *Pst;

public:
	group(int c, int y)
	{
	groupID = c;
	startYear = y;
	students = 0;
	}

	~group()
	{
		delete []Pst;
	}

	void printGroup()
	{
	cout<<"ID "<<groupID<<", start "<<startYear<<'\n';
	for (int i=0; i<students; i++)
			Pst[i].print();
		cout<<students<<" students \n";	
	}

	void addStudent(char Name[SIZE], int year)
	{
	
	student *Ptemp = Pst;
	Pst = new student[students+1];

	for (int i=0; i<students; i++)
		Pst[i] = Ptemp[i];
	
	strcpy(Pst[students].name, Name);
	Pst[students].age = year;

	if (students>0) delete [students]Ptemp; // здесь вылетает 

	students ++;

	
	}
};

int main()
{

	group g1(01, 2012);
	g1.printGroup();

	g1.addStudent("Petya Pupkin", 25);
	g1.printGroup();

	g1.addStudent("Katya Pupkin", 24);
	g1.printGroup();

	g1.addStudent("Kat3 Pipkin", 23);
	g1.printGroup();

	//system("pause");
	return 0;
}

Pst = new student[students+1];