Originally Posted by DaWei

That is incorrect, zaka. A reference is a second name (alias) for an object. You can't name something that doesn't exist, therefore you have to specify the object being aliased when you declare the reference. When a reference is passed as an argument, a copy of the objects address is passed. This is one fewer levels of indirection than when a pointer to the object is passed.

Originally Posted by aisha.ansari84

i agree to it

class Date
{
               Date& add_year(int);
               Date& add_month(int);
               Date& add_day(int);
}
int main()
{
              Date a();
             a.add_year(1).add_month(2).add_day(2);
                 return 0;
}
Date& Date::add_year(int n)
{
                  if(d==29&&m==2&&!leapyear(y+n)
                  {
                              d=1;
                               m=3;
                   }
                    y+=n;
                     return  *this;
}
Date& Date::add_month(int n)
{
                 return *this;
}
Date& Date::add_day(int n)
{
               return *this;
}

int main()
{
    char *ptr;
    int retval = 0;
    retval = someFunc();
    if(retval)
        ptr = "I got some address";
    someOtherFunc(ptr);
}

void someOtherFunc(char *ptr)
{
    if(ptr)
    {
        // use ptr
     }
}