7.6.                                      _ 201

cl.tickO ;

return cl;

}

,         . -
   .

     -   
(--)    ,     
.       -
,     .    --
, 

++       . operator++()
   --, 
++      operator++()

7.6.   

    clock  ,    -
.  ,    .   -
    -,     
    ,     -
     .   
        (
 ). ,       
.

    clock,    .

  clock, 

class clock {

friend clock operator +(clock cl, clock c2);

};

clock operator+(clock cl, clock c2)
{

return (cl.tot_secs + c2.tot_secs) ;

r

      clock   
 clock: : clock (unsigned long).     lock -
   ,       
 .  operator+ ()   
,    .  , -
      -
.

, ,      -.