a.cc

#include <sys/types.h>
#include <unistd.h>
#include <iostream>

using namespace std;

main()
{
  
   int x = 6;
   int pid = fork();
   
   if (pid > 0) 
   {
	   x = 200;
	   cout << "parent" << "x = " << x << " " << &x << endl;
	   sleep(100);
   }
   else
   {
	   sleep(10);
	   cout << "child" << "x = " << x << " " << &x << endl;
	   sleep(100);
   }

}