74  3.   

int add3(int a, int b, int )
{

return (a + b + c) ;

}

double average(int s)

{

return (s / 3.0);

}

  add3

 int add3(int, int, int,);

double average(int);

    .    
   ,      -
      .

 sum = add3(1.5 * score_l, score_2, 0.5 * score_3);

B C++         -
 .

 int add3(int , int b, int )

(

return ( + b + ) ;

}

   .       
.       main ().

          ,

int add3(int , int b, int );

 .

3.5.   

        (default argument).
  ,      . -
           .
   :

  def_args.cpp

int sqr_or_power(int n, int k = 2)   //k = 2  
{