Can we access a private variable using pointer in C++

Question

Suppose there is a code snippet
class test
{
int a;
};
int main()
{

test obj;
int* ptr;
}
how can I store the address of obj .a in ptr. ?

Answer 1

You can use a function in test to point ptr at a, but if you do that you could also just make a public in the first place...

Answer 2

just using the pointer and c++ statements only.... no functions

Answer 3

Well, you need to find the variable somehow, if you don't want functions you'll need a public pointer to a in test.