#include <cstdlib>
#include <iostream>

using namespace std;
  double add( double w , double e);
int main(){
  double a=5;
  double b=8;
  cout<<"average is "<<add(a,b)<<endl;
    system("PAUSE");
    return EXIT_SUCCESS;
}
{ double add(double w, double e){
         return x*y;
         }