when two class are friend of each other

[fakhruddin]

next class access property of previous class but previous class can't access member of next class when both class are friend of each other

class previous
{
friend class next;

int x;
public:
A(){cin>>x;}
void set()
{
cin>>x;
}
void display(next a)
{

cout<<a.x; // error: x is not a member of next
}
};

class next
{
friend class previous;

public:
int x;
B(){cin>>x;}
void set()
{

}
void display(previous a)
{
cout<<a.x;
}
};
anyone can solve this problem

[ne555]

class B; //forward declaration
class A
{
	friend class B;

	int x;
	public:
	A(){cin>>x;}
	void set()
	{
		cin>>x;
	}
	void display(B a); //just declaration
};

class B
{
	friend class A;

	public:
	int x;
	B(){cin>>x;}
	void set()
	{

	}
	void display(A a)
	{
		cout<<a.x;
	}
};

void A::display(B a) //now we have the definition of B, so can code the function
{
	cout<<a.x;
}

[coder777]

Read this (Friend classes):

http://www.cplusplus.com/doc/tutorial/inheritance/


What you need is a forward declaration of next:

class next; // forward declaration

class previous
{
friend class next;
...

Read this:
http://en.cppreference.com/w/cpp/language/class