[SunilC]

#include<iostream>
using namespace std;

class A {
	
	int a,b;
	A obj;
	
};
main()
{
	cout<< " making of the object \n";
	A allo;
	cout << "Object completed develpoped\n";
	cout << sizeof(A);
	cout << "now the size of object\n";
	cout << sizeof(allo);
}

When I compiled this code it gives the error I . e. incomplete type
is not allowed.............but when I put static

Such as

#include<iostream>
using namespace std;

class A {
	
	int a,b;
	static A obj;
	
};
main()
{
	cout<< " making of the object \n";
	A allo;
	cout << "Object completed develpoped\n";
	cout << sizeof(A);
	cout << "now the size of object\n";
	cout << sizeof(allo);
}

It compiles without error giving the output as 8 in cout <<
sizeof(A); and the same 8 also in cout << sizeof(allo);

Can somebody throw some light on the behavior of static object in
its own class.

[shabbir]

When its non static you are creating a cycle where the object has an object within itself as a member which is practically impossible to have but when it becomes static its equivalent to global object and so compiler does not give any error.

[SATYAN JANA]

I'll add one thing that,-
just declare the class as:-
class A {
int a,b;
A *obj;
};
Your problem will be solved. Otherwise, it becomes a recursive definition, which is not allowed. You can surely have a self-referencing pointer.