#include <stdio.h>

#define ERROR -1

main()
{
   int flag, status;

   if ( fork() ){    
      printf("parent - pid= %d, ppid= %d\n",getpid(),getppid());
      flag = 100;
   }
   else {
      printf("child - pid= %d ppid= %d\n",getpid(),getppid());
      flag = 200;
   }
	printf("\n Common part of parent+child--->flag = %d\n",flag);
}