Memory addresses signed - unsigned

[savavampir]

I just have fun with pointers a bit and found that i can actually hold some variable address as value in another non-pointer variable, never seen an example of this before. Now i am wondering how are memory addresses stored, i mean, can they be negative?

#include <iostream>

typedef unsigned long int ulong;

int main()
{
	ulong number  = 10;
	ulong address = (ulong)&number;//hold number address as value

	std::cout << "number value is " << number << std::endl;
	ulong* ptr = (ulong*)address;//set to point at that address
	*ptr = 11;//alter value at address
	std::cout << "number value is " << number << std::endl;

	std::cout << "Press enter to exit..." << std::endl;
	std::cin.get(); 
	return 0;
} 

[LB]

Pointers are almost always 'considered' as unsigned. Remember, though, that bits are exactly the same signed or unsigned, so your question 'can memory addresses be negative' makes no sense.

[savavampir]

Thanks.