=====empty===== Syntax:


    #include 
    bool empty() const;

The empty() function returns true if the stack has no elements, false otherwise. For example, the following code uses empty() as the stopping condition on a while loop to clear a stack and display its contents in reverse order:


   stack s;
   for( int i = 0; i < 5; i++ ) {
     s.push(i);
   }
   while( !s.empty() ) {
     cout << s.top() << endl;
     s.pop();
   }