Is address of global variables the same for different runs of the program?

Question

Consider the following code snippet

int i=10;
int main()
{
    cout<<&i;
}

Once an exe is generated for the program, will the output be the same for different runs of the program? Assume that the OS supports virtual memory

Edit:The ques is specific to global variables which are stored in data segment. Since this is the first global variable, should the address come out to be same or different?

Answer 1

You always get the same addresses if ASLR is disabled. You get unpredictable addresses if ASLR is enabled.

Answer 2

The virtual address will be whatever the linker decided. The physical address will vary with each load.

Answer 3

Simple answer: It depends :-)

If your OS starts for a program always the same environment with a virtual memory range which looks always the same, the output should be always the same.

But if you run the same os on different hardware ( maybe with different amount of ram available ) it could be res ult in a different address but normally the address is also the same, independent of the hardware.

But you should NEVER expect that the result is the same! In a short: Don't think about the virtual or real address of data in your prog. This is under control from the compiler, the OS and maybe some libraries as well. So simply ignore it!