fork() system call and memory space of the process

Question

I quote \"when a process creates a new process using fork() call, Only the shared memory segments are shared between the parent process and the newly forked child process. C

Answer 1

Yes, both processes are using the same address for this variable, but these addresses are used by different processes, and therefore aren't in the same virtual address space.

This means that the addresses are the same, but they aren't pointing to the same physical memory. You should read more about virtual memory to understand this.